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Pentax 645Z vs Sony A7 III

The Pentax 645Z and the Sony Alpha A7 III are two digital cameras that were officially introduced, respectively, in April 2014 and February 2018. The 645Z is a DSLR, while the A7 III is a mirrorless interchangeable lens camera. The cameras are based on a medium format (645Z) and a full frame (A7 III) sensor. The Pentax has a resolution of 51.1 megapixels, whereas the Sony provides 24 MP.

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

Headline Specifications
Pentax 645Z   Sony A7 III
Pentax 645Z Sony A7 III
Digital single lens reflex Mirrorless system camera
Pentax 645 mount lenses Sony E mount lenses
51.1 MP, Medium Format Sensor 24 MP, Full Frame Sensor
1080/60i Video 4K/30p Video
ISO 100-204800 ISO 100-51200 (50-204800)
Optical viewfinder Electronic viewfinder (2359k dots)
3.2" LCD, 1037k dots 3.0" LCD, 922k 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 charge610 shots per battery charge
156 x 117 x 123 mm, 1550 g 127 x 96 x 74 mm, 650 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645Z and the Sony Alpha A7 III? 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 physical size and weight of the Pentax 645Z and the Sony A7 III are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

Size Pentax 645Z vs Sony A7 III
Compare 645Z versus A7 III top
Comparison 645Z or A7 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7 III is considerably smaller (33 percent) than the Pentax 645Z. Moreover, the A7 III is substantially lighter (58 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 A7 III can take 610 images on a single charge of its NP-FZ100 power pack. The power pack in the A7 III 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 want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Pentax 645Z» 6.1 in 4.6 in 4.8 in 54.7 oz 650 Y Apr 2014 8,499 i i Pentax 645Z
 
Sony A7 III« 5.0 in 3.8 in 2.9 in 22.9 oz 610 Y Feb 2018 1,999 i i Sony A7 III
 
Canon 6D Mark II« » 5.7 in 4.4 in 3.0 in 27.0 oz 1200 Y Jun 2017 1,999 i i Canon 6D Mark II
 
Canon 1D X Mark II« » 6.2 in 6.6 in 3.3 in 54.0 oz 1210 Y Feb 2016 5,999 i i Canon 1D X Mark II
 
Canon 5DS« » 6.0 in 4.6 in 3.0 in 32.8 oz 700 Y Feb 2015 3,699 i i Canon 5DS
 
Canon 5DS R« » 6.0 in 4.6 in 3.0 in 32.8 oz 700 Y Feb 2015 3,699 i i Canon 5DS R
 
Hasselblad X1D« » 5.9 in 3.9 in 2.8 in 25.6 oz .. Y Jun 2016 8,995- i Hasselblad X1D
 
Leica SL« » 5.8 in 4.1 in 1.5 in 29.9 oz 400 Y Oct 2015 7,450 i i Leica SL
 
Nikon D850« » 5.7 in 4.9 in 3.1 in 35.5 oz 1840 Y Jul 2017 3,299 i i Nikon D850
 
Nikon D5« » 6.3 in 6.3 in 3.6 in 49.9 oz 3780 Y Jan 2016 6,499 i i Nikon D5
 
Nikon D7200« » 5.4 in 4.2 in 3.0 in 27.0 oz 1110 Y Mar 2015 1,199- i Nikon D7200
 
Nikon D4S« » 6.3 in 6.2 in 3.6 in 47.6 oz 3020 Y Feb 2014 6,499- i Nikon D4S
 
Pentax 645D« » 6.1 in 4.6 in 4.7 in 52.2 oz 800 Y Mar 2010 9,995- i Pentax 645D
 
Sony A9« » 5.0 in 3.8 in 2.5 in 23.7 oz 650 Y Apr 2017 4,499 i i Sony A9
 
Sony A7R II« » 5.0 in 3.8 in 2.4 in 22.0 oz 290 Y Jun 2015 3,199- i Sony A7R II
 
Sony A7 II« » 5.0 in 3.8 in 2.4 in 21.1 oz 350 Y Nov 2014 1,999- i Sony A7 II
 
Sony A7« » 5.0 in 3.7 in 1.9 in 16.7 oz 340 Y Oct 2013 1,699- i Sony A7
Note: Measurements and pricing do not include easily detachable parts, such as 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 A7 III was launched at a markedly lower price (by 76 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 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 A7 III a full frame sensor. The sensor area in the A7 III 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 A7 III offers a 3:2 aspect.

Pentax 645Z and Sony A7 III sensor measures

With 51.1MP, the 645Z offers a higher resolution than the A7 III (24MP), but the 645Z has smaller individual pixels (pixel pitch of 5.30μm versus 5.94μm for the A7 III). Moreover, the A7 III is a much more recent model (by 3 years and 10 months) than the 645Z, and its sensor will have benefitted from technological advances during this time that 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 inch or 104.9 x 78.6 cm, for very good quality (250 dpi) 33 x 24.8 inch or 83.9 x 62.9 cm, and for excellent quality (300 dpi) 27.5 x 20.6 inch or 69.9 x 52.4 cm. The corresponding values for the Sony A7 III are 30 x 20 inch or 76.2 x 50.8 cm for good quality, 24 x 16 inch or 61 x 40.6 cm for very good quality, and 20 x 13.3 inch or 50.8 x 33.9 cm for excellent quality prints.

The A7 III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Pentax 645Z has a native sensitivity range from ISO 100 to ISO 204800. The corresponding ISO settings for the Sony Alpha A7 III are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.

645Z versus A7 III 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 review, the 645Z has a notably higher overall DXO score than the A7 III (overall score 5 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 1 bits higher color depth, and 0.3 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.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Pentax 645Z» Medium Format 51.1 8256 61921080/60i26.014.74505101Pentax 645Z
 
Sony A7 III« Full Frame 24.0 6000 40004K/30p25.014.7373096Sony A7 III
 
Canon 6D Mark II« » Full Frame 26.0 6240 41601080/60p24.411.9286285Canon 6D Mark II
 
Canon 1D X Mark II« » Full Frame 20.0 5472 36484K/60p24.113.5320788Canon 1D X Mark II
 
Canon 5DS« » Full Frame 50.3 8688 57921080/30p24.712.4238187Canon 5DS
 
Canon 5DS R« » Full Frame 50.3 8688 57921080/30p24.612.4230886Canon 5DS R
 
Hasselblad X1D« » Medium Format 51.3 8272 62001080/25p26.214.84489102Hasselblad X1D
 
Leica SL« » Full Frame 24.0 6000 40004K/30p25.013.4182188Leica SL
 
Nikon D850« » Full Frame 45.4 8256 55044K/30p26.414.82660100Nikon D850
 
Nikon D5« » Full Frame 20.7 5588 37124K/30p25.112.3234388Nikon D5
 
Nikon D7200« » APS-C 24.0 6000 40001080/60p24.514.6133387Nikon D7200
 
Nikon D4S« » Full Frame 16.2 4928 32801080/60p24.413.3307489Nikon D4S
 
Pentax 645D« » Medium Format 39.5 7264 5440-24.612.6126282Pentax 645D
 
Sony A9« » Full Frame 24.0 6000 40004K/30p24.913.3351792Sony A9
 
Sony A7R II« » Full Frame 42.2 7952 53044K/30p26.013.9343498Sony A7R II
 
Sony A7 II« » Full Frame 24.0 6000 40001080/60p24.913.6244990Sony A7 II
 
Sony A7« » Full Frame 24.0 6000 40001080/60p24.814.2224890Sony A7

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A7 III provides a better video resolution than the 645Z. It can shoot movie footage at 4K/30p, while the Pentax is limited to 1080/60i.

 

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A7 III has an electronic viewfinder (2359k 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 A7 III 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 adjacent table lists some of the other core features of the Pentax 645Z and Sony A7 III along with similar information for a selection of comparators.

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
Camera
Model
 
Pentax 645Z»optical Y 3.2 1037 tilting n 1/4000s 3.0 n n Pentax 645Z
 
Sony A7 III«2359 n 3.0 922 tilting Y 1/8000s 10.0 n Y Sony A7 III
 
Canon 6D Mark II« »optical Y 3.0 1040 swivel Y 1/4000s 6.5 n n Canon 6D Mark II
 
Canon 1D X Mark II« »optical Y 3.2 1620 fixed Y 1/8000s 16.0 n n Canon 1D X Mark II
 
Canon 5DS« »optical Y 3.2 1040 fixed n 1/8000s 5.0 n n Canon 5DS
 
Canon 5DS R« »optical Y 3.2 1040 fixed n 1/8000s 5.0 n n Canon 5DS R
 
Hasselblad X1D« »2360 n 3.0 920 fixed Y 1/2000s 2.3 n n Hasselblad X1D
 
Leica SL« »4400 Y 3.0 1040 fixed Y 1/8000s 11.0 n n Leica SL
 
Nikon D850« »optical Y 3.2 2359 tilting Y 1/8000s 9.0 n n Nikon D850
 
Nikon D5« »optical Y 3.2 2359 fixed Y 1/8000s 14.0 n n Nikon D5
 
Nikon D7200« »optical Y 3.2 1229 fixed n 1/8000s 6.0 Y n Nikon D7200
 
Nikon D4S« »optical Y 3.2 921 fixed n 1/8000s 11.0 n n Nikon D4S
 
Pentax 645D« »optical Y 3.0 921 fixed n 1/4000s 1.1 n n Pentax 645D
 
Sony A9« »3686 n 3.0 1440 tilting Y 1/8000s 20.0 n Y Sony A9
 
Sony A7R II« »2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7R II
 
Sony A7 II« »2400 n 3.0 1230 tilting n 1/8000s 5.0 n Y Sony A7 II
 
Sony A7« »2400 n 3.0 1230 tilting n 1/8000s 5.0 n n Sony A7

One feature that is present on the 645Z, but is missing on the A7 III 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 A7 III 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 A7 III 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.

The 645Z writes its imaging data to SDXC cards, while the A7 III uses SDXC or Memory Stick PRO Duo cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. The A7 III supports UHS-II cards (on its first slot), while the 645Z can use UHS-I 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 645Z and Sony Alpha A7 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Type
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
 
Pentax 645Z»YstereomonoY-mini3.0---Pentax 645Z
 
Sony A7 III«YstereomonoYYmicro3.1YYYSony A7 III
 
Canon 6D Mark II« »YstereomonoY-mini2.0YYYCanon 6D Mark II
 
Canon 1D X Mark II« »YmonomonoYYmini3.0---Canon 1D X Mark II
 
Canon 5DS« »YmonomonoY-mini3.0---Canon 5DS
 
Canon 5DS R« »YmonomonoY-mini3.0---Canon 5DS R
 
Hasselblad X1D« »YstereomonoYYmini3.0Y--Hasselblad X1D
 
Leica SL« »YstereomonoYYfull3.0Y--Leica SL
 
Nikon D850« »YstereomonoYYmini3.0YYYNikon D850
 
Nikon D5« »YstereomonoYYmini3.0---Nikon D5
 
Nikon D7200« »YstereomonoYYmini2.0YY-Nikon D7200
 
Nikon D4S« »YmonomonoYYmini2.0---Nikon D4S
 
Pentax 645D« »Ystereo----2.0---Pentax 645D
 
Sony A9« »YstereomonoYYmicro2.0YYYSony A9
 
Sony A7R II« »YstereomonoYYmicro2.0YY-Sony A7R II
 
Sony A7 II« »YstereomonoYYmicro2.0YY-Sony A7 II
 
Sony A7« »YstereomonoYYmicro2.0YY-Sony A7

It is notable that the A7 III 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 offer wifi capability.

Studio photographers will appreciate that the Pentax 645Z (unlike the A7 III) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 645Z and the A7 III are recent models that are part of the current product line-up. The 645Z replaced the earlier Pentax 645D, while the A7 III followed on from the Sony A7 II. 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.


Review summary

So what is the bottom line? Is the Pentax 645Z better than the Sony A7 III or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Pentax 645Z:

  • More detail: Offers more megapixels (51.1 vs 24MP) with a 43% higher linear resolution.
  • Better image quality: Scores markedly higher (5 points) in the DXO overall assessment.
  • 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 detailed LCD: Has a higher resolution rear screen (1037k vs 922k dots).
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More heavily discounted: Has been available for much longer (launched in April 2014).

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Arguments in favor of the Sony Alpha A7 III:

  • 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%).
  • 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 (127x96mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 900g or 58 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 (76 percent cheaper at launch).
  • More modern: Reflects 3 years and 10 months of technical progress since the 645Z launch.

If the count of individual advantages (bullet points above) is taken as a guide, the A7 III is the clear winner of the contest (20 : 8 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 08:20 A7 III

How about other alternatives? Do the specifications of the Pentax 645Z and the Sony A7 III 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 A7 III in practical situations. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is why hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). 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.

Review Scores
  Camera
Model
cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Pentax 645Z»--4.5/55/55/5 Apr 2014 8,499 i i Pentax 645Z
 
Sony A7 III«+ +89/1005/55/55/5 Feb 2018 1,999 i i Sony A7 III
 
Canon 6D Mark II« »+80/1004.5/54/54/5 Jun 2017 1,999 i i Canon 6D Mark II
 
Canon 1D X Mark II« »-89/1004.5/55/54.5/5 Feb 2016 5,999 i i Canon 1D X Mark II
 
Canon 5DS« »+83/1004.5/55/54.5/5 Feb 2015 3,699 i i Canon 5DS
 
Canon 5DS R« »+83/1005/55/54.5/5 Feb 2015 3,699 i i Canon 5DS R
 
Hasselblad X1D« »o81/100--4/5 Jun 2016 8,995- i Hasselblad X1D
 
Leica SL« »-84/1004.5/54/54/5 Oct 2015 7,450 i i Leica SL
 
Nikon D850« »+ +89/1004.5/55/55/5 Jul 2017 3,299 i i Nikon D850
 
Nikon D5« »-89/1004.5/55/55/5 Jan 2016 6,499 i i Nikon D5
 
Nikon D7200« »+ +84/1004.5/54/54.5/5 Mar 2015 1,199- i Nikon D7200
 
Nikon D4S« »--4.5/55/54.5/5 Feb 2014 6,499- i Nikon D4S
 
Pentax 645D« »---4.5/5- Mar 2010 9,995- i Pentax 645D
 
Sony A9« »+ +89/1005/55/55/5 Apr 2017 4,499 i i Sony A9
 
Sony A7R II« »+ +90/1005/54.5/55/5 Jun 2015 3,199- i Sony A7R II
 
Sony A7 II« »+82/1004.5/55/55/5 Nov 2014 1,999- i Sony A7 II
 
Sony A7« »+ +80/1005/54.5/55/5 Oct 2013 1,699- i Sony A7
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 comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Pentax 645Z:
Check Amazon price
Sony A7 III:
Check Amazon price

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. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Pentax 645Z vs Sony A7 III

    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 A7 III
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax 645 mount lenses Sony E mount lenses
    Launch Date April 2014 February 2018
    Launch Price USD 8499 USD 1999
    Sensor Specs Pentax 645Z Sony A7 III
    Sensor Technology CMOS BSI-CMOS
    Sensor Format Medium Format Sensor Full Frame Sensor
    Sensor Size 43.8 x 32.8 mm 35.6 x 23.8 mm
    Sensor Area 1436.64 mm2 847.28 mm2
    Sensor Diagonal 54.7 mm 42.8 mm
    Crop Factor 0.79x 1.0x
    Sensor Resolution 51.1 Megapixels 24 Megapixels
    Image Resolution 8256 x 6192 pixels 6000 x 4000 pixels
    Pixel Pitch 5.30 μm 5.94 μm
    Pixel Density 3.56 MP/cm2 2.83 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60i Video 4K/30p Video
    ISO Setting 100-204800 ISO 100-51200 ISO
    ISO Boost no Enhancement 50-204800 ISO
    Image Processor PRIME III BIONZ X
    DXO Sensor Quality (score) 101 96
    DXO Color Depth (bits) 26.0 25.0
    DXO Dynamic Range (EV) 14.7 14.7
    DXO Low Light (ISO) 4505 3730
    Screen Specs Pentax 645Z Sony A7 III
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 98% 100%
    Viewfinder Magnification 0.78x 0.78x
    Viewfinder Resolution 2359k dots
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.2 inch 3.0 inch
    LCD Resolution 1037k dots 922k dots
    LCD Attachment Tilting screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax 645Z Sony A7 III
    Autofocus System Phase-detect AF On-Sensor Phase-detect
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000/s 1/8000/s
    Continuous Shooting 3 shutter flaps/s 10 shutter flaps/s
    Shutter Life Expectancy100 000 actuations200 000 actuations
    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 MS or SDXC cards
    Second Storage Option Dual card slots Dual card slots
    UHS card support UHS-I Single UHS-II
    Connectivity Specs Pentax 645Z Sony A7 III
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    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 A7 III
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type D-LI90 NP-FZ100
    Battery Life (CIPA)650 shots per charge610 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 96 x 74 mm
    (5.0 x 3.8 x 2.9 in)
    Camera Weight 1550 g (54.7 oz) 650 g (22.9 oz)

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