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Pentax 645Z vs Sony RX10 III

The Pentax 645Z and the Sony Cyber-shot DSC-RX10 III are two digital cameras that were officially introduced, respectively, in April 2014 and March 2016. The 645Z is a DSLR, while the RX10 III is a fixed lens compact. The cameras are based on a medium format (645Z) and an one-inch (RX10 III) sensor. The Pentax has a resolution of 51.1 megapixels, whereas the Sony provides 20 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 RX10 III
Pentax 645Z   Sony RX10 III
Digital single lens reflex Fixed lens compact camera
Pentax 645 mount lenses 24-600mm f/2.4-4.0
51.1 MP, Medium Format Sensor 20 MP, 1" Sensor
1080/60i Video 4K/30p Video
ISO 100-204,800 ISO 100-12,800 (64 - 25,600)
Optical viewfinder Electronic viewfinder (2359k dots)
3.2 LCD, 1037k dots 3.0 LCD, 1229k dots
Tilting screen (no touchscreen) Tilting screen (not touch-sensitive)
3 shutter flaps per second 14 shutter flaps per second
Weathersealed bodyWeathersealed body
650 shots per battery charge420 shots per battery charge
156 x 117 x 123 mm, 1550 g 133 x 94 x 127 mm, 1051 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645Z and the Sony Cyber-shot DSC-RX10 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 side-by-side display below illustrates the physical size and weight of the Pentax 645Z and the Sony RX10 III. 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 RX10 III
Compare 645Z versus RX10 III top
Comparison 645Z or RX10 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony RX10 III is considerably smaller (32 percent) than the Pentax 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 and possibly misleading, as the RX10 III has a lens built in, whereas the 645Z is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.

Concerning battery life, the 645Z gets 650 shots out of its D-LI90 battery, while the RX10 III can take 420 images on a single charge of its NP-FW50 power pack. The power pack in the RX10 III can be charged via the USB port, which can be very convenient when travelling.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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
    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 RX10 III 133 mm 94 mm 127 mm 1051 g 420 Y Mar 2016 1,499 i
3.
 
Canon 1D X Mark II 158 mm 168 mm 83 mm 1530 g 1210 Y Feb 2016 5,999i
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 8,995i
7.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450i
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 6,499i
10.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199i
11.
 
Nikon D4S 160 mm 157 mm 91 mm 1350 g 3020 Y Feb 2014 6,499i
12.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995i
13.
 
Sony RX10 IV 133 mm 94 mm 145 mm 1095 g 400 Y Sep 2017 1,699 i
14.
 
Sony RX0 59 mm 41 mm 30 mm 110 g 240 Y Aug 2017 699i
15.
 
Sony RX100 V 102 mm 58 mm 41 mm 299 g 220 n Oct 2016 999 i
16.
 
Sony RX10 II 129 mm 88 mm 102 mm 813 g 400 Y Jun 2015 1,299i
17.
 
Sony RX10 129 mm 88 mm 102 mm 813 g 420 Y Oct 2013 1,299i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

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 RX10 III was launched at a lower price than the 645Z, despite having a lens built in. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. 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.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to 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 RX10 III an one-inch sensor. The sensor area in the RX10 III is 92 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 2.7. The sensor in the 645Z has a native 4:3 aspect ratio, while the one in the RX10 III offers a 3:2 aspect.

Pentax 645Z and Sony RX10 III sensor measures

With 51.1MP, the 645Z offers a higher resolution than the RX10 III (20MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 2.41μm for the RX10 III) due to its larger sensor. However, the RX10 III is a somewhat more recent model (by 1 year and 11 months) than the 645Z, and its sensor might 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 the 645Z has no anti-alias filter installed, so that it can capture all the detail its 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 RX10 III are 27.4 x 18.2 inches or 69.5 x 46.3 cm for good quality, 21.9 x 14.6 inches or 55.6 x 37.1 cm for very good quality, and 18.2 x 12.2 inches or 46.3 x 30.9 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 Cyber-shot DSC-RX10 III are ISO 100 to ISO 12800, with the possibility to increase the ISO range to 64-25600.

645Z versus RX10 III MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). Of the two cameras under review, the 645Z provides substantially higher image quality than the RX10 III, with an overall score that is 31 points higher. This advantage is based on 2.9 bits higher color depth, 2.1 EV in additional dynamic range, and 3.3 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
    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 RX10 III 1-inch 20.0 5472 36484K/30p23.112.647270
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 SL Full Frame 24.0 6000 40004K/30p25.013.4182188
8.
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660100
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 RX10 IV 1-inch 20.0 5472 36484K/30p........
14.
 
Sony RX0 1-inch 15.4 4800 32001080/60p22.412.454868
15.
 
Sony RX100 V 1-inch 20.0 5472 36484K/30p22.812.458670
16.
 
Sony RX10 II 1-inch 20.0 5472 36484K/30p23.012.653170
17.
 
Sony RX10 1-inch 20.0 5472 36481080/60p22.912.647469

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the RX10 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

Apart from body and sensor, cameras can and do differ across a range of features. For example, the RX10 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 viewfinder in the RX10 III 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 0.70x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Pentax 645Z, the Sony RX10 III, and comparable cameras.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/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 Y3.2 / 1037 tilting n 1/4000s 3.0 n n
2.
 
Sony RX10 III2359 Y3.0 / 1229 tilting n 1/2000s 14.0 Y Y
3.
 
Canon 1D X Mark IIoptical Y3.2 / 1620 fixed Y 1/8000s 16.0 n n
4.
 
Canon 5DSoptical Y3.2 / 1040 fixed n 1/8000s 5.0 n n
5.
 
Canon 5DS Roptical Y3.2 / 1040 fixed n 1/8000s 5.0 n n
6.
 
Hasselblad X1D2360 n3.0 / 920 fixed Y 1/2000s 2.3 n n
7.
 
Leica SL4400 Y3.0 / 1040 fixed Y 1/8000s 11.0 n n
8.
 
Nikon D850optical Y3.2 / 2359 tilting Y 1/8000s 9.0 n n
9.
 
Nikon D5optical Y3.2 / 2359 fixed Y 1/8000s 14.0 n n
10.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0 Y n
11.
 
Nikon D4Soptical Y3.2 / 921 fixed n 1/8000s 11.0 n n
12.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1 n n
13.
 
Sony RX10 IV2359 Y3.0 / 1440 tilting Y 1/2000s 24.0 Y Y
14.
 
Sony RX0none n1.5 / 230 fixed n .. 5.5 n n
15.
 
Sony RX100 V2359 n3.0 / 1229 tilting n 1/2000s 24.0 Y Y
16.
 
Sony RX10 II2359 Y3.0 / 1229 tilting n 1/3200s 14.0 Y Y
17.
 
Sony RX101440 Y3.0 / 1229 tilting n 1/3200s 10.0 Y Y

One difference between the cameras concerns the presence of an on-board flash. The RX10 III has one, while the 645Z does not. While the built-in flash of the RX10 III is not very powerful, it can at times be useful as a fill-in light.

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 RX10 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 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 RX10 III 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 RX10 III 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.

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 Cyber-shot DSC-RX10 III 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
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax 645ZYstereo / monoY-mini3.0---
2.
 
Sony RX10 IIIYstereo / 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 SLYstereo / monoYYfull3.0Y--
8.
 
Nikon D850Ystereo / monoYYmini3.0YYY
9.
 
Nikon D5Ystereo / monoYYmini3.0---
10.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
11.
 
Nikon D4SYmono / monoYYmini2.0---
12.
 
Pentax 645DYstereo / ----2.0---
13.
 
Sony RX10 IVYstereo / monoYYmicro2.0YY-
14.
 
Sony RX0-stereo / monoY-micro2.0Y-Y
15.
 
Sony RX100 V-stereo / mono--micro2.0YY-
16.
 
Sony RX10 IIYstereo / monoYYmicro2.0YY-
17.
 
Sony RX10Ystereo / monoYYmicro2.0YY-

It is notable that the RX10 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 provide wifi capability.

Studio photographers will appreciate that the Pentax 645Z (unlike the RX10 III) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 645Z and the RX10 III are recent models that are part of the current product line-up. The 645Z replaced the earlier Pentax 645D, while the RX10 III followed on from the Sony RX10 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 conclusions can be drawn? Is there a clear favorite between the Pentax 645Z and the Sony RX10 III? Which camera is better? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Pentax 645Z:

  • More detail: Offers more megapixels (51.1 vs 20MP) with a 57% higher linear resolution.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (31 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (2.9 bits more color depth).
  • More dynamic range: Captures a larger spectrum of light and dark details (2.1 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (3.3 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 0.70x).
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Faster shutter: Has higher mechanical shutter speed (1/4000s vs 1/2000s) to freeze action.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More flexible: Can take a variety of interchangeable lenses, including specialty optics.
  • Longer lasting: Can take more shots (650 versus 420) 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 heavily discounted: Has been on the market for longer (launched in April 2014).

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Reasons to prefer the Sony Cyber-shot DSC-RX10 III:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better video: Provides higher definition movie capture (4K/30p vs 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 (1229k vs 1037k dots).
  • Faster burst: Shoots at higher frequency (14 vs 3 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Ready to shoot: Comes with an integrated lens, while the 645Z requires a separate lens.
  • More compact: Is smaller (133x94mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight even though it has a lens built in (unlike the 645Z).
  • 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.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • 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 at a lower price, despite coming with a built-in lens.
  • More modern: Was introduced somewhat (1 year and 11 months) more recently.

If the count of relative strengths (bullet points above) is taken as a measure, the RX10 III comes out slightly ahead of the 645Z (18 : 17 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.

645Z 17:18 RX10 III

How about other alternatives? Do the specifications of the Pentax 645Z and the Sony RX10 III place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Superzoom 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 RX10 III 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 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 (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
     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......4.5/55/5 Apr 2014 8,499 i
2.
 
Sony RX10 III5/5+..84/1004.5/54.5/5 Mar 2016 1,499 i
3.
 
Canon 1D X Mark II....4.5/589/1004.5/54.5/5 Feb 2016 5,999i
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..o..81/100..4/5 Jun 2016 8,995i
7.
 
Leica SL4/5..4/584/1004.5/54/5 Oct 2015 7,450i
8.
 
Nikon D8504.5/5+ +5/589/1004.5/55/5 Jul 2017 3,299 i
9.
 
Nikon D5....4/589/1004.5/55/5 Jan 2016 6,499i
10.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199i
11.
 
Nikon D4S5/5......4.5/54.5/5 Feb 2014 6,499i
12.
 
Pentax 645D5/5.......... Mar 2010 9,995i
13.
 
Sony RX10 IV5/5+..84/1004.5/55/5 Sep 2017 1,699 i
14.
 
Sony RX0........3.5/54/5 Aug 2017 699i
15.
 
Sony RX100 V4.5/5+ +..83/1004/54.5/5 Oct 2016 999 i
16.
 
Sony RX10 II5/5+ +..82/1004.5/54/5 Jun 2015 1,299i
17.
 
Sony RX105/5+..80/1004.5/54.5/5 Oct 2013 1,299i
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, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Pentax 645Z:
Check Amazon price
Sony RX10 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 RX10 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 RX10 III
    Camera Type Digital single lens reflex Fixed lens compact camera
    Camera Lens Pentax 645 mount lenses 24-600mm f/2.4-4.0
    Launch Date April 2014 March 2016
    Launch Price USD 8,499 USD 1,499
    Sensor Specs Pentax 645Z Sony RX10 III
    Sensor Technology CMOS BSI-CMOS
    Sensor Format Medium Format Sensor 1" Sensor
    Sensor Size 43.8 x 32.8 mm 13.2 x 8.8 mm
    Sensor Area 1436.64 mm2 116.16 mm2
    Sensor Diagonal 54.7 mm 15.9 mm
    Crop Factor 0.79x 2.7x
    Sensor Resolution 51.1 Megapixels 20 Megapixels
    Image Resolution 8256 x 6192 pixels 5472 x 3648 pixels
    Pixel Pitch 5.30 μm 2.41 μm
    Pixel Density 3.56 MP/cm2 17.18 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 1080/60i Video 4K/30p Video
    ISO Setting 100 - 204,800 ISO 100 - 12,800 ISO
    ISO Boost no Enhancement 64 - 25,600 ISO
    Image Processor PRIME III BIONZ X
    DXO Sensor Quality (score) 101 70
    DXO Color Depth (bits) 26.0 23.1
    DXO Dynamic Range (EV) 14.7 12.6
    DXO Low Light (ISO) 4505 472
    Screen Specs Pentax 645Z Sony RX10 III
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 98% 100%
    Viewfinder Magnification 0.78x 0.70x
    Viewfinder Resolution 2359k dots
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.2inch 3.0inch
    LCD Resolution 1037k dots 1229k dots
    LCD Attachment Tilting screen Tilting screen
    Shooting Specs Pentax 645Z Sony RX10 III
    Focus System Phase-detect AF Contrast-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/2000s
    Continuous Shooting 3 shutter flaps/s 14 shutter flaps/s
    Electronic Shutterno E-Shutterup to 1/32000s
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Fill Flash no On-Board Flash Built-in Flash
    Storage Medium SDXC cards MS or SDXC cards
    Second Storage Option Dual card slots Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Pentax 645Z Sony RX10 III
    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 RX10 III
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type D-LI90 NP-FW50
    Battery Life (CIPA)650 shots per charge420 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)
    133 x 94 x 127 mm
    (5.2 x 3.7 x 5.0 in)
    Camera Weight 1550 g (54.7 oz) 1051 g (37.1 oz)

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    You are here Home  »  CAM-parator  »  Pentax 645Z vs Sony RX10 III

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