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Pentax 645Z vs Sony A7R

The Pentax 645Z and the Sony Alpha A7R are two digital cameras that were revealed to the public, respectively, in April 2014 and October 2013. The 645Z is a DSLR, while the A7R is a mirrorless interchangeable lens camera. The cameras are based on a medium format (645Z) and a full frame (A7R) sensor. The Pentax has a resolution of 51.1 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 645Z
versus
Sony A7R
Pentax 645Z   Sony A7R
Digital single lens reflex Mirrorless system camera
Pentax 645 mount lenses Sony E mount lenses
51.1 MP – Medium Format sensor 36.2 MP – Full Frame sensor
1080/60i Video 1080/60p Video
ISO 100-204,800 ISO 100-25,600 (50 - 51,200)
Optical viewfinder Electronic viewfinder (2400k dots)
3.2" LCD – 1037k dots 3.0" LCD – 1230k dots
Tilting screen (no touchscreen) Tilting screen (no touchscreen)
3 shutter flaps per second 4 shutter flaps per second
Weathersealed bodyWeathersealed body
650 shots per battery charge340 shots per battery charge
156 x 117 x 123 mm, 1550 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 645Z 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 side-by-side display below illustrates the physical size and weight of the Pentax 645Z and the Sony A7R. 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 width, height and depth measures are rounded to the nearest millimeter.

Size Pentax 645Z vs Sony A7R
Compare 645Z versus A7R top
Comparison 645Z 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 645Z. Moreover, the A7R is substantially lighter (70 percent) than the 645Z. 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 645Z gets 650 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 table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

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Body Specifications
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499ebay.com
2.
 
Sony A7R 127 mm 94 mm 48 mm 465 g 340 Y Oct 2013 2,299ebay.com
3.
 
Canon 1D X Mark II 158 mm 168 mm 83 mm 1530 g 1210 Y Feb 2016 5,999ebay.com
4.
 
Canon 5DS 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
5.
 
Canon 5DS R 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
6.
 
Hasselblad X1D 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995ebay.com
7.
 
Leica M11 139 mm 80 mm 39 mm 640 g 700 Y Jan 2022 8,995 amazon.com
8.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450ebay.com
9.
 
Nikon D5 160 mm 159 mm 92 mm 1415 g 3780 Y Jan 2016 6,499ebay.com
10.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199ebay.com
11.
 
Nikon D4S 160 mm 157 mm 91 mm 1350 g 3020 Y Feb 2014 6,499ebay.com
12.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.com
13.
 
Sony A7C II 124 mm 71 mm 63 mm 514 g 540 Y Aug 2023 2,199 amazon.com
14.
 
Sony A7 IV 131 mm 96 mm 80 mm 659 g 580 Y Oct 2021 2,499 amazon.com
15.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199ebay.com
16.
 
Sony A7S 127 mm 94 mm 48 mm 489 g 380 Y Apr 2014 2,499ebay.com
17.
 
Sony A7 127 mm 94 mm 48 mm 474 g 340 Y Oct 2013 1,699ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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The price is, of course, an important factor in any camera decision. 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 73 percent) than the 645Z, 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 tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Pentax 645Z features a medium format sensor and the Sony A7R a full frame sensor. The sensor area in the A7R is 40 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 645Z has a native 4:3 aspect ratio, while the one in the A7R offers a 3:2 aspect.

Pentax 645Z and Sony A7R sensor measures

With 51.1MP, the 645Z offers a higher resolution than the A7R (36.2MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 4.88μm for the A7R) due to its larger sensor. Moreover, the 645Z is a somewhat more recent model (by 5 months) than the A7R, and its sensor might 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 resolution advantage of the Pentax 645Z implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645Z for good quality output (200 dots per inch) amounts to 41.3 x 31 inches or 104.9 x 78.6 cm, for very good quality (250 dpi) 33 x 24.8 inches or 83.9 x 62.9 cm, and for excellent quality (300 dpi) 27.5 x 20.6 inches or 69.9 x 52.4 cm. The corresponding values for the Sony A7R are 36.8 x 24.6 inches or 93.5 x 62.4 cm for good quality, 29.4 x 19.6 inches or 74.8 x 49.9 cm for very good quality, and 24.5 x 16.4 inches or 62.3 x 41.6 cm for excellent quality prints.

The Pentax 645Z has a native sensitivity range from ISO 100 to ISO 204800. 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.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

645Z versus A7R MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under review, the 645Z has a notably higher overall DXO score than the A7R (overall score 6 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.4 bits higher color depth, 0.6 EV in additional dynamic range, and 0.7 stops in additional low light sensitivity. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
2.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
3.
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.5320788
4.
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187
5.
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.4230886
6.
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102
7.
 
Leica M11 Full Frame 60.3 9528 6328none26.314.83376100
8.
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188
9.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
10.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
11.
 
Nikon D4S Full Frame 16.2 4928 32801080/60p24.413.3307489
12.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
13.
 
Sony A7C II Full Frame 32.7 7008 46724K/60p25.414.7323796
14.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
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
17.
 
Sony A7 Full Frame 24.0 6000 40001080/60p24.814.2224890
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras are not only capable of taking still images, but also of capturing video footage. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A7R provides a faster frame rate than the 645Z. It can shoot movie footage at 1080/60p, while the Pentax is limited to 1080/60i.

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Feature comparison

Apart from 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 645Z 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 645Z (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645Z 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 table below summarizes some of the other core capabilities of the Pentax 645Z and Sony A7R in connection with corresponding information for a sample of similar cameras.

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Core Features
# image 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 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
2.
 
Sony A7R2400 n3.0 / 1230 tilting n 1/8000s 4.0/s n n
3.
 
Canon 1D X Mark IIoptical Y3.2 / 1620 fixed Y 1/8000s 16.0/s n n
4.
 
Canon 5DSoptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
5.
 
Canon 5DS Roptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
6.
 
Hasselblad X1D2360 n3.0 / 920 fixed Y 1/2000s 2.3/s n n
7.
 
Leica M11optical n3.0 / 2333 fixed Y 1/4000s 4.5/s n n
8.
 
Leica SL4400 Y3.0 / 1040 fixed Y 1/8000s 11.0/s n n
9.
 
Nikon D5optical Y3.2 / 2359 fixed Y 1/8000s 14.0/s n n
10.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
11.
 
Nikon D4Soptical Y3.2 / 921 fixed n 1/8000s 11.0/s n n
12.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
13.
 
Sony A7C II2360 n3.0 / 1037 swivel Y 1/4000s 10.0/s n Y
14.
 
Sony A7 IV3686 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
15.
 
Sony A7R II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
16.
 
Sony A7S2400 n3.0 / 921 tilting n 1/8000s 5.0/s n n
17.
 
Sony A72400 n3.0 / 1230 tilting n 1/8000s 5.0/s n n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One feature that is present on the 645Z, 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 645Z 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 645Z writes its imaging data to SDXC cards, while the A7R uses SDXC or Memory Stick PRO Duo cards. The 645Z features dual card slots, which can be very useful in case a memory card fails. In contrast, the A7R only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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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 645Z 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
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax 645ZYstereo / monoY-mini3.0---
2.
 
Sony A7RYstereo / monoYYmicro2.0YY-
3.
 
Canon 1D X Mark IIYmono / monoYYmini3.0---
4.
 
Canon 5DSYmono / monoY-mini3.0---
5.
 
Canon 5DS RYmono / monoY-mini3.0---
6.
 
Hasselblad X1DYstereo / monoYYmini3.0Y--
7.
 
Leica M11Y- / ----3.2Y-Y
8.
 
Leica SLYstereo / monoYYfull3.0Y--
9.
 
Nikon D5Ystereo / monoYYmini3.0---
10.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
11.
 
Nikon D4SYmono / monoYYmini2.0---
12.
 
Pentax 645DYstereo / ----2.0---
13.
 
Sony A7C IIYstereo / monoYYmicro3.2Y-Y
14.
 
Sony A7 IVYstereo / monoYYfull3.2Y-Y
15.
 
Sony A7R IIYstereo / monoYYmicro2.0YY-
16.
 
Sony A7SYstereo / monoYYmicro2.0YY-
17.
 
Sony A7Ystereo / monoYYmicro2.0YY-
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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 645Z does not provide wifi capability.

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

Both the 645Z and the A7R have been discontinued, but can regularly be found used on ebay. The A7R was replaced by the Sony A7R II, while the 645Z does not have a direct successor. Further information on the features and operation of the 645Z and A7R can be found, respectively, in the Pentax 645Z Manual (free pdf) or the online Sony A7R Manual.

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Review summary

So what is the bottom line? Which of the two cameras – the Pentax 645Z 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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Advantages of the Pentax 645Z:

  • More detail: Offers more megapixels (51.1 vs 36.2MP) with a 17% higher linear resolution.
  • Better image quality: Scores markedly higher (6 points) in the DXO overall assessment.
  • More dynamic range: Captures a larger spectrum of light and dark details (0.6 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (0.7 stops ISO advantage).
  • 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.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Can take more shots (650 versus 340) on a single battery charge.
  • Faster data transfer: Supports a more advanced USB protocol (3.0 vs 2.0).
  • 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 modern: Is somewhat more recent (announced 5 months after the A7R).

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Reasons to prefer the Sony Alpha A7R:

  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • 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 1037k dots).
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (4 vs 3 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 1085g or 70 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.
  • More affordable: Was introduced into a lower priced category (73 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in October 2013).

If the number of relative strengths (bullet points above) is taken as a guide, the A7R comes out slightly ahead of the 645Z (15 : 14 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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.

645Z 14:15 A7R

How about other alternatives? Do the specifications of the Pentax 645Z 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 says little about, for example, the shooting experience and imaging performance of the 645Z and the A7R in practical situations. 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 where reviews by experts come in. 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
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 8,499ebay.com
2.
 
Sony A7R5/5+ +..82/1004.5/55/5 Oct 2013 2,299ebay.com
3.
 
Canon 1D X Mark II....4.5/589/1004.5/54.5/5 Feb 2016 5,999ebay.com
4.
 
Canon 5DS..+..83/1004.5/54.5/5 Feb 2015 3,699ebay.com
5.
 
Canon 5DS R5/5+..83/1005/54.5/5 Feb 2015 3,699ebay.com
6.
 
Hasselblad X1D..o..81/100..4/5 Jun 2016 8,995ebay.com
7.
 
Leica M114.5/5..4.5/5..4.5/54.5/5 Jan 2022 8,995 amazon.com
8.
 
Leica SL4/5..4/584/1004.5/54/5 Oct 2015 7,450ebay.com
9.
 
Nikon D5....4/589/1004.5/55/5 Jan 2016 6,499ebay.com
10.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199ebay.com
11.
 
Nikon D4S5/5......4.5/54.5/5 Feb 2014 6,499ebay.com
12.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
13.
 
Sony A7C II4/5..4/587/1004.5/54.5/5 Aug 2023 2,199 amazon.com
14.
 
Sony A7 IV5/5+ +4.5/589/1004.5/54.5/5 Oct 2021 2,499 amazon.com
15.
 
Sony A7R II5/5+ +5/590/1005/55/5 Jun 2015 3,199ebay.com
16.
 
Sony A7S4/5....86/1004.5/55/5 Apr 2014 2,499ebay.com
17.
 
Sony A75/5+ +..80/1005/55/5 Oct 2013 1,699ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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The above review scores should be interpreted with care, though. The ratings are only valid when referring to cameras in the same category and of the same age. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, 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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    Specifications: Pentax 645Z 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 645Z Sony A7R
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax 645 mount lenses Sony E mount lenses
    Launch Date April 2014 October 2013
    Launch Price USD 8,499 USD 2,299
    Sensor Specs Pentax 645Z Sony A7R
    Sensor Technology CMOS CMOS
    Sensor Format Medium Format Sensor Full Frame Sensor
    Sensor Size 43.8 x 32.8 mm 35.9 x 24.0 mm
    Sensor Area 1436.64 mm2 861.6 mm2
    Sensor Diagonal 54.7 mm 43.2 mm
    Crop Factor 0.79x 1.0x
    Sensor Resolution 51.1 Megapixels 36.2 Megapixels
    Image Resolution 8256 x 6192 pixels 7360 x 4912 pixels
    Pixel Pitch 5.30 μm 4.88 μm
    Pixel Density 3.56 MP/cm2 4.20 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60i Video 1080/60p Video
    ISO Setting 100 - 204,800 ISO 100 - 25,600 ISO
    ISO Boost no Enhancement 50 - 51,200 ISO
    Image Processor PRIME III BIONZ X
    DXO Sensor Quality (score) 101 95
    DXO Color Depth (bits) 26.0 25.6
    DXO Dynamic Range (EV) 14.7 14.1
    DXO Low Light (ISO) 4505 2746
    Screen Specs Pentax 645Z 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 Live View
    Rear LCD Size 3.2inch 3.0inch
    LCD Resolution 1037k dots 1230k dots
    LCD Attachment Tilting screen Tilting screen
    Shooting Specs Pentax 645Z Sony A7R
    Focus System Phase-detect AF Contrast-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 3 shutter flaps/s 4 shutter flaps/s
    Shutter Life Expectancy100 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 UHS-I UHS-I
    Connectivity Specs Pentax 645Z Sony A7R
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 3.0 USB 2.0
    HDMI Port mini HDMI micro HDMI
    Microphone Port External MIC port 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 645Z Sony A7R
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Pentax D-LI90 Sony NP-FW50
    Battery Life (CIPA)650 shots per charge340 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 156 x 117 x 123 mm
    (6.1 x 4.6 x 4.8 in)
    127 x 94 x 48 mm
    (5.0 x 3.7 x 1.9 in)
    Camera Weight 1550 g (54.7 oz) 465 g (16.4 oz)
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    Check 645Z offers at
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    Check A7R offers at
    ebay.com

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