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Pentax 645D vs Sony A7R

The Pentax 645D and the Sony Alpha A7R are two digital cameras that were officially introduced, respectively, in March 2010 and October 2013. The 645D is a DSLR, while the A7R is a mirrorless interchangeable lens camera. The cameras are based on a medium format (645D) and a full frame (A7R) sensor. The Pentax has a resolution of 39.5 megapixels, whereas the Sony provides 36.2 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Pentax 645D
versus
Sony A7R
Pentax 645D   Sony A7R
Digital single lens reflex Mirrorless system camera
Pentax 645 mount lenses Sony E mount lenses
39.5 MP – Medium Format sensor 36.2 MP – Full Frame sensor
no Video 1080/60p Video
ISO 100-1,600 ISO 100-25,600 (50 - 51,200)
Optical viewfinder Electronic viewfinder (2400k dots)
3.0" LCD – 921k dots 3.0" LCD – 1230k dots
Fixed screen (not touch-sensitive) Tilting screen (no touchscreen)
1.1 shutter flaps per second 4 shutter flaps per second
Weathersealed bodyWeathersealed body
800 shots per battery charge340 shots per battery charge
156 x 117 x 119 mm, 1480 g 127 x 94 x 48 mm, 465 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645D and the Sony Alpha A7R? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

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Body comparison

The physical size and weight of the Pentax 645D and the Sony A7R are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter.

Size Pentax 645D vs Sony A7R
Compare 645D versus A7R top
Comparison 645D or A7R rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7R is considerably smaller (35 percent) than the Pentax 645D. Moreover, the A7R is substantially lighter (69 percent) than the 645D. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the 645D gets 800 shots out of its Pentax D-LI90 battery, while the A7R can take 340 images on a single charge of its Sony NP-FW50 power pack. The power pack in the A7R can be charged via the USB port, which can be very convenient when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 i Mar 2010 US$ 9 995ebay.com
2.
 
Sony A7R 127 mm 94 mm 48 mm 465 g 340 i Oct 2013 US$ 2 299ebay.com
3.
 
Canon 1D Mark IV 156 mm 157 mm 80 mm 1230 g 1500 i Oct 2009 US$ 4 999ebay.com
4.
 
Canon 1D X 158 mm 168 mm 83 mm 1551 g 1120 i Oct 2011 US$ 6 799ebay.com
5.
 
Canon 1D X Mark II 158 mm 168 mm 83 mm 1530 g 1210 i Feb 2016 US$ 5 999ebay.com
6.
 
Leica S Typ 006 160 mm 120 mm 80 mm 1260 g .. i Sep 2012 US$ 21 949ebay.com
7.
 
Nikon D3S 160 mm 157 mm 88 mm 1240 g 4200 i Oct 2009 US$ 5 199ebay.com
8.
 
Nikon D5 160 mm 159 mm 92 mm 1415 g 3780 i Jan 2016 US$ 6 499ebay.com
9.
 
Nikon D810 146 mm 123 mm 82 mm 980 g 1200 i Jun 2014 US$ 3 299ebay.com
10.
 
Nikon D850 146 mm 124 mm 79 mm 1005 g 1840 i Jul 2017 US$ 3 299 amazon.com
11.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 i Apr 2014 US$ 8 499ebay.com
12.
 
Sony A7 127 mm 94 mm 48 mm 474 g 340 i Oct 2013 US$ 1 699ebay.com
13.
 
Sony A7 IV 131 mm 96 mm 80 mm 659 g 580 i Oct 2021 US$ 2 499 amazon.com
14.
 
Sony A7C II 124 mm 71 mm 63 mm 514 g 540 i Aug 2023 US$ 2 199 amazon.com
15.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 i Jun 2015 US$ 3 199ebay.com
16.
 
Sony A7S 127 mm 94 mm 48 mm 489 g 380 i Apr 2014 US$ 2 499ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
  empty Camera
Model

Any camera decision will obviously take relative prices into account. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The A7R was launched at a markedly lower price (by 77 percent) than the 645D, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down.

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Pentax 645D features a medium format sensor and the Sony A7R a full frame sensor. The sensor area in the A7R is 41 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.0. The sensor in the 645D has a native 4:3 aspect ratio, while the one in the A7R offers a 3:2 aspect.

Pentax 645D and Sony A7R sensor measures

With 39.5MP, the 645D offers a slightly higher resolution than the A7R (36.2MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.88μm for the A7R) due to its larger sensor. However, the A7R is a much more recent model (by 3 years and 7 months) than the 645D, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The Pentax 645D has a native sensitivity range from ISO 100 to ISO 1600. The corresponding ISO settings for the Sony Alpha A7R are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-51200.

In terms of underlying technology, the 645D is build around a CCD sensor, while the A7R uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

645D versus A7R MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the A7R offers substantially better image quality than the 645D (overall score 13 points higher). The advantage is based on 1 bits higher color depth, 1.5 EV in additional dynamic range, and 1.1 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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Sensor Characteristics
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Pentax 645D Medium Format 39.5 7264 5440i24.612.6126282
2.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
3.
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.0132074
4.
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.8278682
5.
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.5320788
6.
 
Leica S Typ 006 Medium Format 37.5 7500 5000i23.912.282476
7.
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.0325382
8.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
9.
 
Nikon D810 Full Frame 36.2 7360 49121080/60p25.714.8285397
10.
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660100
11.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
12.
 
Sony A7 Full Frame 24.0 6000 40001080/60p24.814.2224890
13.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
14.
 
Sony A7C II Full Frame 32.7 7008 46724K/60p25.414.7323796
15.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
16.
 
Sony A7S Full Frame 12.0 4240 28321080/60p23.913.2370287
Note: DXO values in italics represent estimates based on sensor size and age.
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
  empty Camera
Model

Many modern cameras are not only capable of taking still images, but can also record movies. The A7R indeed provides for movie recording, while the 645D does not. The highest resolution format that the A7R can use is 1080/60p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A7R has an electronic viewfinder (2400k dots), while the 645D has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinder in the A7R offers a wider field of view (100%) than the one in the 645D (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645D has a higher magnification (0.78x vs 0.71x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Pentax 645D and Sony A7R along with similar information for a selection of comparators.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Pentax 645Doptical i3.0 / 921 fixed i 1/4000s 1.1/s i i
2.
 
Sony A7R2400 i3.0 / 1230 tilting i 1/8000s 4.0/s i i
3.
 
Canon 1D Mark IVoptical i3.0 / 920 fixed i 1/8000s 10.0/s i i
4.
 
Canon 1D Xoptical i3.2 / 1040 fixed i 1/8000s 14.0/s i i
5.
 
Canon 1D X Mark IIoptical i3.2 / 1620 fixed i 1/8000s 16.0/s i i
6.
 
Leica S Typ 006optical i3.0 / 922 fixed i 1/4000s 1.5/s i i
7.
 
Nikon D3Soptical i3.0 / 921 fixed i 1/8000s 11.0/s i i
8.
 
Nikon D5optical i3.2 / 2359 fixed i 1/8000s 14.0/s i i
9.
 
Nikon D810optical i3.2 / 1229 fixed i 1/8000s 5.0/s i i
10.
 
Nikon D850optical i3.2 / 2359 tilting i 1/8000s 9.0/s i i
11.
 
Pentax 645Zoptical i3.2 / 1037 tilting i 1/4000s 3.0/s i i
12.
 
Sony A72400 i3.0 / 1230 tilting i 1/8000s 5.0/s i i
13.
 
Sony A7 IV3686 i3.0 / 1037 swivel i 1/8000s 10.0/s i i
14.
 
Sony A7C II2360 i3.0 / 1037 swivel i 1/4000s 10.0/s i i
15.
 
Sony A7R II2400 i3.0 / 1229 tilting i 1/8000s 5.0/s i i
16.
 
Sony A7S2400 i3.0 / 921 tilting i 1/8000s 5.0/s i i
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
  empty Camera
Model

One feature that is present on the 645D, but is missing on the A7R is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

The Pentax 645D has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

The 645D writes its imaging data to SDXC cards, while the A7R uses SDXC or Memory Stick PRO Duo cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the A7R only has one slot. The A7R supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the 645D cannot take advantage of Ultra High Speed SD cards.

Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Pentax 645D and Sony Alpha A7R and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax 645Distereo / iiii2.0iii
2.
 
Sony A7Ristereo / monoiimicro2.0iii
3.
 
Canon 1D Mark IVistereo / iiimini2.0iii
4.
 
Canon 1D Ximono / iiimini2.0iii
5.
 
Canon 1D X Mark IIimono / monoiimini3.0iii
6.
 
Leica S Typ 006ii / iiimini2.0iii
7.
 
Nikon D3Sistereo / iiimini2.0iii
8.
 
Nikon D5istereo / monoiimini3.0iii
9.
 
Nikon D810istereo / monoiimini3.0iii
10.
 
Nikon D850istereo / monoiimini3.0iii
11.
 
Pentax 645Zistereo / monoiimini3.0iii
12.
 
Sony A7istereo / monoiimicro2.0iii
13.
 
Sony A7 IVistereo / monoiifull3.2iii
14.
 
Sony A7C IIistereo / monoiimicro3.2iii
15.
 
Sony A7R IIistereo / monoiimicro2.0iii
16.
 
Sony A7Sistereo / monoiimicro2.0iii
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
  empty Camera
Model

It is notable that the A7R offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 645D does not provide wifi capability.

Studio photographers will appreciate that the Pentax 645D (unlike the A7R) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 645D and the A7R have been discontinued, but can regularly be found used on ebay. The 645D was replaced by the Pentax 645Z, while the A7R was followed by the Sony A7R II. Further information on the features and operation of the 645D and A7R can be found, respectively, in the Pentax 645D Manual (free pdf) or the online Sony A7R Manual.

Review summary

So how do things add up? Which of the two cameras – the Pentax 645D or the Sony A7R – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Pentax 645D:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.71x).
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Can take more shots (800 versus 340) on a single battery charge.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been available for much longer (launched in March 2010).

ilogo

Advantages of the Sony Alpha A7R:

  • Better image quality: Scores substantially higher (13 points) in the DXO overall evaluation.
  • More dynamic range: Captures a broader range of light and dark details (1.5 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.1 stops ISO advantage).
  • Broader imaging potential: Can capture not only stills but also 1080/60p video.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More complete view: Has a viewfinder with a larger field of view (100% vs 98%).
  • More detailed LCD: Has a higher resolution rear screen (1230k vs 921k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (4 vs 1.1 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (127x94mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 1015g or 69 percent) and is thus easier to take along.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More affordable: Was introduced into a lower priced category (77 percent cheaper at launch).
  • More modern: Reflects 3 years and 7 months of technical progress since the 645D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the A7R is the clear winner of the contest (19 : 8 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

645D 08:19 A7R

How about other alternatives? Do the specifications of the Pentax 645D and the Sony A7R place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 645D or the A7R. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax 645D5/5.......... Mar 2010 US$ 9 995ebay.com
2.
 
Sony A7R5/5+ +..82/1004.5/55/5 Oct 2013 US$ 2 299ebay.com
3.
 
Canon 1D Mark IV5/5....89/100.... Oct 2009 US$ 4 999ebay.com
4.
 
Canon 1D X5/5......4.5/54.5/5 Oct 2011 US$ 6 799ebay.com
5.
 
Canon 1D X Mark II....4.5/589/1004.5/54.5/5 Feb 2016 US$ 5 999ebay.com
6.
 
Leica S Typ 006............ Sep 2012 US$ 21 949ebay.com
7.
 
Nikon D3S5/5....89/1004.5/55/5 Oct 2009 US$ 5 199ebay.com
8.
 
Nikon D5....4/589/1004.5/55/5 Jan 2016 US$ 6 499ebay.com
9.
 
Nikon D8105/5..5/586/1005/54.5/5 Jun 2014 US$ 3 299ebay.com
10.
 
Nikon D8504.5/5+ +5/589/1004.5/55/5 Jul 2017 US$ 3 299 amazon.com
11.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 US$ 8 499ebay.com
12.
 
Sony A75/5+ +..80/1005/55/5 Oct 2013 US$ 1 699ebay.com
13.
 
Sony A7 IV5/5+ +4.5/589/1004.5/54.5/5 Oct 2021 US$ 2 499 amazon.com
14.
 
Sony A7C II4/5..4/587/1004.5/54.5/5 Aug 2023 US$ 2 199 amazon.com
15.
 
Sony A7R II5/5+ +5/590/1005/55/5 Jun 2015 US$ 3 199ebay.com
16.
 
Sony A7S4/5....86/1004.5/55/5 Apr 2014 US$ 2 499ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
  empty  Camera 
 Model 

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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  • Canon SX430
  • Canon SX500
  • Canon SX510
  • Canon SX520
  • Canon SX530
  • Canon SX540
  • Canon SX600
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  • Canon SX700
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  • Canon Rebel
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  • Canon T100
  • Canon V1
  • Canon XC10
  • Canon XS
  • Canon XSi
  • Canon XT
  • Canon XTi
  • Contax N Digital
  • Epson R-D1
  • Fujifilm GFX 50R
  • Fujifilm GFX 50S
  • Fujifilm GFX 50S II
  • Fujifilm GFX 100
  • Fujifilm GFX 100 II
  • Fujifilm GFX 100RF
  • Fujifilm GFX 100S
  • Fujifilm GFX 100S II
  • Fujifilm X-A1
  • Fujifilm X-A2
  • Fujifilm X-A3
  • Fujifilm X-A5
  • Fujifilm X-A7
  • Fujifilm X-A10
  • Fujifilm X-E1
  • Fujifilm X-E2
  • Fujifilm X-E2S
  • Fujifilm X-E3
  • Fujifilm X-E4
  • Fujifilm X-E5
  • Fujifilm X-H1
  • Fujifilm X-H2
  • Fujifilm X-H2S
  • Fujifilm X-M1
  • Fujifilm X-M5
  • Fujifilm X-Pro1
  • Fujifilm X-Pro2
  • Fujifilm X-Pro3
  • Fujifilm X-S10
  • Fujifilm X-S20
  • Fujifilm X-T1
  • Fujifilm X-T2
  • Fujifilm X-T3
  • Fujifilm X-T4
  • Fujifilm X-T5
  • Fujifilm X-T10
  • Fujifilm X-T20
  • Fujifilm X-T30
  • Fujifilm X-T30 II
  • Fujifilm X-T50
  • Fujifilm X-T100
  • Fujifilm X-T200
  • Fujifilm X10
  • Fujifilm X20
  • Fujifilm X30
  • Fujifilm X70
  • Fujifilm X100
  • Fujifilm X100S
  • Fujifilm X100T
  • Fujifilm X100F
  • Fujifilm X100V
  • Fujifilm X100VI
  • Fujifilm XF10
  • Fujifilm XQ1
  • Fujifilm XQ2
  • Fujifilm XP120
  • Fujifilm XP130
  • Fujifilm XP140
  • Hasselblad X1D
  • Hasselblad X1D II
  • Hasselblad X2D 100C
  • Kodak AZ901
  • Kodak S-1
  • Leica C-LUX
  • Leica CL
  • Leica D-LUX Typ 109
  • Leica D-LUX 5
  • Leica D-LUX 6
  • Leica D-LUX 7
  • Leica D-LUX 8
  • Leica Digilux 3
  • Leica M Typ 240
  • Leica M-E Typ 240
  • Leica M Typ 262
  • Leica M8
  • Leica M9
  • Leica M10
  • Leica M10-P
  • Leica M10-R
  • Leica M11
  • Leica Q Typ 116
  • Leica Q2
  • Leica Q3
  • Leica S1
  • Leica S2
  • Leica S3
  • Leica S Typ 006
  • Leica S-E Typ 006
  • Leica S Typ 007
  • Leica SL
  • Leica SL2
  • Leica SL2-S
  • Leica SL3
  • Leica SL3-S
  • Leica T
  • Leica TL
  • Leica TL2
  • Leica V-LUX 1
  • Leica V-LUX 2
  • Leica V-LUX 3
  • Leica V-LUX 4
  • Leica V-LUX Typ 114
  • Leica V-LUX 5
  • Leica X1
  • Leica X2
  • Leica X Vario
  • Leica X Typ 113
  • Leica X-U Typ 113
  • Leitz Ur-Leica
  • Nikon 1 J4
  • Nikon 1 J5
  • Nikon 1 V1
  • Nikon 1 V2
  • Nikon 1 V3
  • Nikon Coolpix A
  • Nikon A1000
  • Nikon B500
  • Nikon B600
  • Nikon B700
  • Nikon D1
  • Nikon D1H
  • Nikon D1X
  • Nikon D2H
  • Nikon D2X
  • Nikon D2Xs
  • Nikon D3
  • Nikon D3S
  • Nikon D3X
  • Nikon D4
  • Nikon D4S
  • Nikon D5
  • Nikon D6
  • Nikon D40
  • Nikon D40X
  • Nikon D50
  • Nikon D60
  • Nikon D70
  • Nikon D70s
  • Nikon D80
  • Nikon D90
  • Nikon D100
  • Nikon D200
  • Nikon D300
  • Nikon D300S
  • Nikon D500
  • Nikon D600
  • Nikon D610
  • Nikon D700
  • Nikon D750
  • Nikon D780
  • Nikon D800
  • Nikon D800E
  • Nikon D810
  • Nikon D850
  • Nikon D3000
  • Nikon D3100
  • Nikon D3200
  • Nikon D3300
  • Nikon D3400
  • Nikon D3500
  • Nikon D5000
  • Nikon D5100
  • Nikon D5200
  • Nikon D5300
  • Nikon D5500
  • Nikon D5600
  • Nikon D7000
  • Nikon D7100
  • Nikon D7200
  • Nikon D7500
  • Nikon Df
  • Nikon L840
  • Nikon P900
  • Nikon P950
  • Nikon P1000
  • Nikon P1100
  • Nikon P7800
  • Nikon W150
  • Nikon W300
  • Nikon Z5
  • Nikon Z5 II
  • Nikon Z6
  • Nikon Z6 II
  • Nikon Z6 III
  • Nikon Z7
  • Nikon Z7 II
  • Nikon Z8
  • Nikon Z9
  • Nikon Z30
  • Nikon Z50
  • Nikon Z50 II
  • Nikon Zf
  • Nikon Z fc
  • Olympus E-1
  • Olympus E-3
  • Olympus E-5
  • Olympus E-30
  • Olympus E-300
  • Olympus E-330
  • Olympus E-400
  • Olympus E-410
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  • Olympus E-450
  • Olympus E-500
  • Olympus E-510
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  • Olympus E-600
  • Olympus E-620
  • Olympus E-M1
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  • Olympus E-M1 III
  • Olympus E-M1X
  • Olympus E-M5
  • Olympus E-M5 II
  • Olympus E-M5 III
  • Olympus E-M10
  • Olympus E-M10 II
  • Olympus E-M10 III
  • Olympus E-M10 IV
  • Olympus E-P1
  • Olympus E-P2
  • Olympus E-P3
  • Olympus E-P5
  • Olympus E-P7
  • Olympus E-PL1
  • Olympus E-PL2
  • Olympus E-PL3
  • Olympus E-PL5
  • Olympus E-PL6
  • Olympus E-PL7
  • Olympus E-PL8
  • Olympus E-PL9
  • Olympus E-PL10
  • Olympus E-PM1
  • Olympus E-PM2
  • Olympus PEN-F
  • Olympus Stylus 1
  • Olympus Stylus 1s
  • Olympus TG-4
  • Olympus TG-5
  • Olympus TG-6
  • Olympus XZ-1
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  • OM System OM-1
  • OM System OM-1 II
  • OM System OM-3
  • OM System OM-5
  • OM System OM-5 II
  • OM System TG-7
  • Panasonic FZ80
  • Panasonic FZ80D
  • Panasonic FZ100
  • Panasonic FZ150
  • Panasonic FZ200
  • Panasonic FZ300
  • Panasonic FZ1000
  • Panasonic FZ1000 II
  • Panasonic FZ2500
  • Panasonic G1
  • Panasonic G2
  • Panasonic G3
  • Panasonic G5
  • Panasonic G6
  • Panasonic G7
  • Panasonic G9
  • Panasonic G9 II
  • Panasonic G10
  • Panasonic G85
  • Panasonic G97
  • Panasonic G95
  • Panasonic G100
  • Panasonic GF1
  • Panasonic GF2
  • Panasonic GF3
  • Panasonic GF5
  • Panasonic GF6
  • Panasonic GF7
  • Panasonic GH1
  • Panasonic GH2
  • Panasonic GH3
  • Panasonic GH4
  • Panasonic GH5
  • Panasonic GH5 II
  • Panasonic GH5s
  • Panasonic GH6
  • Panasonic GH7
  • Panasonic GM1
  • Panasonic GM5
  • Panasonic GX1
  • Panasonic GX7
  • Panasonic GX8
  • Panasonic GX9
  • Panasonic GX85
  • Panasonic GX850
  • Panasonic L1
  • Panasonic L10
  • Panasonic LF1
  • Panasonic LX5
  • Panasonic LX7
  • Panasonic LX10
  • Panasonic LX100
  • Panasonic LX100 II
  • Panasonic S1
  • Panasonic S1 II
  • Panasonic S1H
  • Panasonic S1R
  • Panasonic S1R II
  • Panasonic S5
  • Panasonic S5 II
  • Panasonic S9
  • Panasonic TS7
  • Panasonic ZS70
  • Panasonic ZS80
  • Panasonic ZS100
  • Panasonic ZS200
  • Pentax 645D
  • Pentax 645Z
  • Pentax K-1
  • Pentax K-1 II
  • Pentax K-3
  • Pentax K-3 II
  • Pentax K-3 III
  • Pentax K-5
  • Pentax K-5 II
  • Pentax K-30
  • Pentax K-50
  • Pentax K-70
  • Pentax K-500
  • Pentax KP
  • Pentax K-S1
  • Pentax K-S2
  • Pentax MX-1
  • Pentax Q
  • Pentax WG-8
  • Pentax WG-90
  • Pentax WG-1000
  • Ricoh GR
  • Ricoh GR II
  • Ricoh GR III
  • Ricoh GR IIIx
  • Ricoh WG-6
  • Ricoh WG-60
  • Samsung NX1
  • Samsung NX30
  • Samsung NX500
  • Sigma fp
  • Sigma fp L
  • Sony A1
  • Sony A1 II
  • Sony A7
  • Sony A7 II
  • Sony A7 III
  • Sony A7 IV
  • Sony A7C
  • Sony A7C II
  • Sony A7C R
  • Sony A7R
  • Sony A7R II
  • Sony A7R III
  • Sony A7R IIIA
  • Sony A7R IV
  • Sony A7R IVA
  • Sony A7R V
  • Sony A7S
  • Sony A7S II
  • Sony A7S III
  • Sony A9
  • Sony A9 II
  • Sony A9 III
  • Sony A58
  • Sony A68
  • Sony A77
  • Sony A77 II
  • Sony A99
  • Sony A99 II
  • Sony A850
  • Sony A900
  • Sony A3000
  • Sony A5000
  • Sony A5100
  • Sony A6000
  • Sony A6100
  • Sony A6300
  • Sony A6400
  • Sony A6500
  • Sony A6600
  • Sony A6700
  • Sony H200
  • Sony H300
  • Sony H400
  • Sony HX80
  • Sony HX90V
  • Sony HX95
  • Sony HX99
  • Sony HX350
  • Sony HX400V
  • Sony NEX-3
  • Sony NEX-3N
  • Sony NEX-5
  • Sony NEX-5N
  • Sony NEX-5R
  • Sony NEX-5T
  • Sony NEX-6
  • Sony NEX-7
  • Sony NEX-C3
  • Sony NEX-F3
  • Sony RX0
  • Sony RX0 II
  • Sony RX1
  • Sony RX1R
  • Sony RX1R II
  • Sony RX1R III
  • Sony RX10
  • Sony RX10 II
  • Sony RX10 III
  • Sony RX10 IV
  • Sony RX100
  • Sony RX100 II
  • Sony RX100 III
  • Sony RX100 IV
  • Sony RX100 V
  • Sony RX100 VI
  • Sony RX100 VII
  • Sony WX800
  • Sony ZV-1
  • Sony ZV-1 II
  • Sony ZV-1F
  • Sony ZV-E1
  • Sony ZV-E10
  • Sony ZV-E10 II
  • YI M1
  • Zeiss ZX1
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Specifications: Pentax 645D vs Sony A7R

Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

Camera Specifications
Camera Model Pentax 645D Sony A7R
Camera Type Digital single lens reflex Mirrorless system camera
Camera Lens Pentax 645 mount lenses Sony E mount lenses
Launch Date March 2010 October 2013
Launch Price USD 9,995 USD 2,299
Sensor Specs Pentax 645D Sony A7R
Sensor Technology CCD CMOS
Sensor Format Medium Format Sensor Full Frame Sensor
Sensor Size 44.0 x 33.0 mm 35.9 x 24.0 mm
Sensor Area 1452 mm2 861.6 mm2
Sensor Diagonal 55 mm 43.2 mm
Crop Factor 0.79x 1.0x
Sensor Resolution 39.5 Megapixels 36.2 Megapixels
Image Resolution 7264 x 5440 pixels 7360 x 4912 pixels
Pixel Pitch 6.06 μm 4.88 μm
Pixel Density 2.72 MP/cm2 4.20 MP/cm2
Moiré control no AA filter no AA filter
Movie Capability no Video 1080/60p Video
ISO Setting 100 - 1,600 ISO 100 - 25,600 ISO
ISO Boost no Enhancement 50 - 51,200 ISO
Image Processor PRIME II BIONZ X
DXO Sensor Quality (score) 82 95
DXO Color Depth (bits) 24.6 25.6
DXO Dynamic Range (EV) 12.6 14.1
DXO Low Light (ISO) 1262 2746
Screen Specs Pentax 645D Sony A7R
Viewfinder Type Optical viewfinder Electronic viewfinder
Viewfinder Field of View 98% 100%
Viewfinder Magnification 0.78x 0.71x
Viewfinder Resolution 2400k dots
Top-Level Screen Control Panel no Top Display
LCD Framing Live View
Rear LCD Size 3.0inch 3.0inch
LCD Resolution 921k dots 1230k dots
LCD Attachment Fixed screen Tilting screen
Shooting Specs Pentax 645D Sony A7R
Focus System Phase-detect AF Contrast-detect AF
Manual Focusing Aidno Peaking FeatureFocus Peaking
Max Shutter Speed (mechanical) 1/4000s 1/8000s
Continuous Shooting 1.1 shutter flaps/s 4 shutter flaps/s
Shutter Life Expectancy50 000 actuations250 000 actuations
Time-Lapse PhotographyIntervalometer built-inno Intervalometer
Fill Flash no On-Board Flash no On-Board Flash
Storage Medium SDXC cards MS or SDXC cards
Single or Dual Card Slots Dual card slots Single card slot
UHS card support no UHS-I
Connectivity Specs Pentax 645D Sony A7R
External Flash Hotshoe Hotshoe
Studio Flash PC Sync socket no PC Sync
USB Connector USB 2.0 USB 2.0
HDMI Port no HDMI micro HDMI
Microphone Port no MIC socket External MIC port
Headphone Socket no Headphone port Headphone port
Wifi Support no Wifi Wifi built-in
Near-Field Communication no NFC NFC built-in
Body Specs Pentax 645D Sony A7R
Environmental SealingWeathersealed bodyWeathersealed body
Battery Type Pentax D-LI90 Sony NP-FW50
Battery Life (CIPA)800 shots per charge340 shots per charge
In-Camera Charging no USB charging USB charging
Body Dimensions 156 x 117 x 119 mm
(6.1 x 4.6 x 4.7 in)
127 x 94 x 48 mm
(5.0 x 3.7 x 1.9 in)
Camera Weight 1480 g (52.2 oz) 465 g (16.4 oz)
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