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Pentax 645Z vs Sony A7R IV

The Pentax 645Z and the Sony Alpha A7R IV are two digital cameras that were officially introduced, respectively, in April 2014 and July 2019. The 645Z is a DSLR, while the A7R IV is a mirrorless interchangeable lens camera. The cameras are based on a medium format (645Z) and a full frame (A7R IV) sensor. The Pentax has a resolution of 51.1 megapixels, whereas the Sony provides 60.2 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 IV
Pentax 645Z Sony A7R IV
Digital single lens reflex Mirrorless system camera
Pentax 645 mount lenses Sony E mount lenses
51.1 MP, Medium Format Sensor 60.2 MP, Full Frame Sensor
1080/60i Video 4K/30p Video
ISO 100-204,800 ISO 100-32,000 (50 - 102,400)
Optical viewfinder Electronic viewfinder (5760k dots)
3.2 LCD, 1037k dots 3.0 LCD, 1440k dots
Tilting screen (no touchscreen) Tilting touchscreen
3 shutter flaps per second 10 shutter flaps per second
Lens stabilization onlyIn-body stabilization
Weathersealed bodyWeathersealed body
650 shots per battery charge670 shots per battery charge
156 x 117 x 123 mm, 1550 g 129 x 96 x 78 mm, 665 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645Z and the Sony Alpha A7R IV? 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.

Body comparison

The side-by-side display below illustrates the physical size and weight of the Pentax 645Z and the Sony A7R IV. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.

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

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7R IV is considerably smaller (32 percent) than the Pentax 645Z. Moreover, the A7R IV is substantially lighter (57 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 D-LI90 battery, while the A7R IV can take 670 images on a single charge of its NP-FZ100 power pack. The power pack in the A7R IV 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. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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Body Specifications
    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 8,499 i
2.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499 i
3.
 
Canon 1D X Mark II 158 mm 168 mm 83 mm 1530 g 1210 Y Feb 2016 5,999 i
4.
 
Canon 5DS 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699 i
5.
 
Canon 5DS R 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699 i
6.
 
Hasselblad X1D 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995 i
7.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450 i
8.
 
Nikon D850 146 mm 124 mm 79 mm 1005 g 1840 Y Jul 2017 3,299 i
9.
 
Nikon D5 160 mm 159 mm 92 mm 1415 g 3780 Y Jan 2016 6,499 i
10.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199 i
11.
 
Nikon D4S 160 mm 157 mm 91 mm 1350 g 3020 Y Feb 2014 6,499 i
12.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995 i
13.
 
Sony A7S III 127 mm 97 mm 81 mm 699 g 600 Y Jul 2020 3,499 i
14.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199 i
15.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499 i
16.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199 i
17.
 
Sony A7S II 127 mm 96 mm 60 mm 627 g 370 Y Sep 2015 2,999 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The A7R IV was launched at a markedly lower price (by 59 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

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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. 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 tend to be more expensive and 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 IV a full frame sensor. The sensor area in the A7R IV 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 645Z has a native 4:3 aspect ratio, while the one in the A7R IV offers a 3:2 aspect.

Pentax 645Z and Sony A7R IV sensor measures

Despite having a smaller sensor, the A7R IV offers a higher resolution of 60.2 megapixels, compared with 51.1 MP of the 645Z. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 5.30μm for the 645Z). However, it should be noted that the A7R IV is much more recent (by 5 years and 3 months) than the 645Z, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. 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 Sony A7R IV implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7R IV for good quality output (200 dots per inch) amounts to 47.5 x 31.7 inches or 120.7 x 80.5 cm, for very good quality (250 dpi) 38 x 25.3 inches or 96.6 x 64.4 cm, and for excellent quality (300 dpi) 31.7 x 21.1 inches or 80.5 x 53.6 cm. The corresponding values for the Pentax 645Z are 41.3 x 31 inches or 104.9 x 78.6 cm for good quality, 33 x 24.8 inches or 83.9 x 62.9 cm for very good quality, and 27.5 x 20.6 inches or 69.9 x 52.4 cm for excellent quality prints.

The A7R IV has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the 645Z, the A7R IV has the capacity to capture high quality composite images (241MP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Pentax 645Z has a native sensitivity range from ISO 100 to ISO 204800. The corresponding ISO settings for the Sony Alpha A7R IV are ISO 100 to ISO 32000, with the possibility to increase the ISO range to 50-102400.

645Z versus A7R IV MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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"). The Overall DXO ratings for the two cameras under consideration are close, suggesting that they provide similar imaging performance. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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Sensor Characteristics
    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 61921080/60i26.014.74505 101
2.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.83344 99
3.
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.53207 88
4.
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.42381 87
5.
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.42308 86
6.
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489 102
7.
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.41821 88
8.
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660 100
9.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.32343 88
10.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.61333 87
11.
 
Nikon D4S Full Frame 16.2 4928 32801080/60p24.413.33074 89
12.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.61262 82
13.
 
Sony A7S III Full Frame 12.0 4240 28324K/120p23.713.92520 86
14.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523 100
15.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.33517 92
16.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.93434 98
17.
 
Sony A7S II Full Frame 12.0 4240 28324K/30p23.613.32993 85

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the A7R IV provides a better video resolution than the 645Z. It can shoot movie footage at 4K/30p, 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 variety of features. For example, the A7R IV has an electronic viewfinder (5760k 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 viewfinders of both cameras offer the same magnification (0.78x), but the one in the A7R IV has a wider field of view (100%) than the finder in the 645Z (98%), so that a larger proportion of the captured image is visible. The table below summarizes some of the other core capabilities of the Pentax 645Z and Sony A7R IV in connection with corresponding information for a sample of similar cameras.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
(000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Pentax 645Zoptical Y 3.2 1037 tilting n 1/4000s 3.0 n n
2.
 
Sony A7R IV5760 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
3.
 
Canon 1D X Mark IIoptical Y 3.2 1620 fixed Y 1/8000s 16.0 n n
4.
 
Canon 5DSoptical Y 3.2 1040 fixed n 1/8000s 5.0 n n
5.
 
Canon 5DS Roptical Y 3.2 1040 fixed n 1/8000s 5.0 n n
6.
 
Hasselblad X1D2360 n 3.0 920 fixed Y 1/2000s 2.3 n n
7.
 
Leica SL4400 Y 3.0 1040 fixed Y 1/8000s 11.0 n n
8.
 
Nikon D850optical Y 3.2 2359 tilting Y 1/8000s 9.0 n n
9.
 
Nikon D5optical Y 3.2 2359 fixed Y 1/8000s 14.0 n n
10.
 
Nikon D7200optical Y 3.2 1229 fixed n 1/8000s 6.0 Y n
11.
 
Nikon D4Soptical Y 3.2 921 fixed n 1/8000s 11.0 n n
12.
 
Pentax 645Doptical Y 3.0 921 fixed n 1/4000s 1.1 n n
13.
 
Sony A7S III9440 n 3.0 1440 swivel Y 1/8000s 10.0 n Y
14.
 
Sony A7R III3686 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
15.
 
Sony A93686 n 3.0 1440 tilting Y 1/8000s 20.0 n Y
16.
 
Sony A7R II2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y
17.
 
Sony A7S II2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y

One feature that is present on the 645Z, but is missing on the A7R IV 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 reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the A7R IV is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Pentax 645Z and the Sony A7R IV both have 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.

Concerning the storage of imaging data, both the 645Z and the A7R IV write their files to SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. The A7R IV supports UHS-II cards (on both slots), while the 645Z can use UHS-I cards.

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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 IV and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax 645ZYstereomonoY-mini3.0---
2.
 
Sony A7R IVYstereomonoYYmicro3.1YYY
3.
 
Canon 1D X Mark IIYmonomonoYYmini3.0---
4.
 
Canon 5DSYmonomonoY-mini3.0---
5.
 
Canon 5DS RYmonomonoY-mini3.0---
6.
 
Hasselblad X1DYstereomonoYYmini3.0Y--
7.
 
Leica SLYstereomonoYYfull3.0Y--
8.
 
Nikon D850YstereomonoYYmini3.0YYY
9.
 
Nikon D5YstereomonoYYmini3.0---
10.
 
Nikon D7200YstereomonoYYmini2.0YY-
11.
 
Nikon D4SYmonomonoYYmini2.0---
12.
 
Pentax 645DYstereo----2.0---
13.
 
Sony A7S IIIYstereomonoYYfull3.2Y-Y
14.
 
Sony A7R IIIYstereomonoYYmicro3.1YYY
15.
 
Sony A9YstereomonoYYmicro2.0YYY
16.
 
Sony A7R IIYstereomonoYYmicro2.0YY-
17.
 
Sony A7S IIYstereomonoYYmicro2.0YY-

It is notable that the A7R IV 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.

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

Both the 645Z and the A7R IV are recent models that are part of the current product line-up. The 645Z replaced the earlier Pentax 645D, while the A7R IV followed on from the Sony A7R III. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Pentax and Sony websites.

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Review summary

So what conclusions can be drawn? Is the Pentax 645Z better than the Sony A7R IV or vice versa? A synthesis of the relative strong points of each of the models is listed below.

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Reasons to prefer the Pentax 645Z:

  • Better low-light sensitivity: Requires less light for good images (0.4 stops ISO advantage).
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • 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.
  • More heavily discounted: Has been available for much longer (launched in April 2014).

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Advantages of the Sony Alpha A7R IV:

  • More detail: Has more megapixels (60.2 vs 51.1MP), which boosts linear resolution by 11%.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/60i).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • 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 (1440k vs 1037k dots).
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (10 vs 3 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (129x96mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 885g or 57 percent) and is thus easier to take along.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • 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.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
  • More affordable: Was introduced into a lower priced category (59 percent cheaper at launch).
  • More modern: Reflects 5 years and 3 months of technical progress since the 645Z launch.

If the count of relative strengths (bullet points above) is taken as a measure, the A7R IV is the clear winner of the contest (24 : 5 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

645Z 05:24 A7R IV

How about other alternatives? Do the specifications of the Pentax 645Z and the Sony A7R IV 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it says little about, for example, the shooting experience and imaging performance of the 645Z and the A7R IV in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why expert reviews are important. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], 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
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax 645Z5/5....4.5/55/5 Apr 2014 8,499 i
2.
 
Sony A7R IV5/5+91/1004.5/55/5 Jul 2019 3,499 i
3.
 
Canon 1D X Mark II....89/1004.5/54.5/5 Feb 2016 5,999 i
4.
 
Canon 5DS..+83/1004.5/54.5/5 Feb 2015 3,699 i
5.
 
Canon 5DS R5/5+83/1005/54.5/5 Feb 2015 3,699 i
6.
 
Hasselblad X1D..o81/100..4/5 Jun 2016 8,995 i
7.
 
Leica SL4/5..84/1004.5/54/5 Oct 2015 7,450 i
8.
 
Nikon D8504.5/5+ +89/1004.5/55/5 Jul 2017 3,299 i
9.
 
Nikon D5....89/1004.5/55/5 Jan 2016 6,499 i
10.
 
Nikon D72004/5+ +84/1004.5/54.5/5 Mar 2015 1,199 i
11.
 
Nikon D4S5/5....4.5/54.5/5 Feb 2014 6,499 i
12.
 
Pentax 645D5/5........ Mar 2010 9,995 i
13.
 
Sony A7S III..+ +91/1004.5/55/5 Jul 2020 3,499 i
14.
 
Sony A7R III..+ +90/1004.5/55/5 Oct 2017 3,199 i
15.
 
Sony A95/5+ +89/1005/55/5 Apr 2017 4,499 i
16.
 
Sony A7R II5/5+ +90/1005/55/5 Jun 2015 3,199 i
17.
 
Sony A7S II5/5+..4.5/55/5 Sep 2015 2,999 i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

Pentax 645Z:
Check Amazon price
Sony A7R IV:
Check Amazon price

Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make a corresponding selection in the search boxes below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Pentax 645Z vs Sony A7R IV

    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 IV
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax 645 mount lenses Sony E mount lenses
    Launch Date April 2014 July 2019
    Launch Price USD 8,499 USD 3,499
    Sensor Specs Pentax 645Z Sony A7R IV
    Sensor Technology CMOS BSI-CMOS
    Sensor Format Medium Format Sensor Full Frame Sensor
    Sensor Size 43.8 x 32.8 mm 35.7 x 23.8 mm
    Sensor Area 1436.64 mm2 849.66 mm2
    Sensor Diagonal 54.7 mm 42.9 mm
    Crop Factor 0.79x 1.0x
    Sensor Resolution 51.1 Megapixels 60.2 Megapixels
    Image Resolution 8256 x 6192 pixels 9504 x 6336 pixels
    Pixel Pitch 5.30 μm 3.76 μm
    Pixel Density 3.56 MP/cm2 7.09 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60i Video 4K/30p Video
    ISO Setting 100 - 204,800 ISO 100 - 32,000 ISO
    ISO Boost no Enhancement 50 - 102,400 ISO
    Image Processor PRIME III BIONZ X
    DXO Sensor Quality (score) 101 99
    DXO Color Depth (bits) 26.0 26.0
    DXO Dynamic Range (EV) 14.7 14.8
    DXO Low Light (ISO) 4505 3344
    Screen Specs Pentax 645Z Sony A7R IV
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 98% 100%
    Viewfinder Magnification 0.78x 0.78x
    Viewfinder Resolution 5760k 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 1440k dots
    LCD Attachment Tilting screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax 645Z Sony A7R IV
    Focus System Phase-detect AF On-Sensor Phase-detect
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 3 shutter flaps/s 10 shutter flaps/s
    Electronic Shutterno E-ShutterYES
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Second Storage Option Dual card slots Dual card slots
    UHS card support UHS-I Dual UHS-II
    Connectivity Specs Pentax 645Z Sony A7R IV
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 3.0 USB 3.1
    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
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Pentax 645Z Sony A7R IV
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type D-LI90 NP-FZ100
    Battery Life (CIPA)650 shots per charge670 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)
    129 x 96 x 78 mm
    (5.1 x 3.8 x 3.1 in)
    Camera Weight 1550 g (54.7 oz) 665 g (23.5 oz)

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