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Pentax 645Z vs Sony RX0 II

The Pentax 645Z and the Sony Cyber-shot DSC-RX0II are two digital cameras that were announced, respectively, in April 2014 and March 2019. The 645Z is a DSLR, while the RX0 II is a fixed lens compact. The cameras are based on a medium format (645Z) and an one-inch (RX0 II) sensor. The Pentax has a resolution of 51.1 megapixels, whereas the Sony provides 15.4 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 RX0 II
Pentax 645Z   Sony RX0 II
Digital single lens reflex Fixed lens compact camera
Pentax 645 mount lenses 24mm f/4.0
51.1 MP – Medium Format sensor 15.4 MP – 1" sensor
1080/60i Video 4K/30p Video
ISO 100-204,800 ISO 80-12,800
Optical viewfinder No viewfinder, LCD framing
3.2" LCD – 1037k dots 1.5" LCD – 230k dots
Tilting screen (no touchscreen) Tilting screen (no touchscreen)
3 shutter flaps per second 5.5 shutter flaps per second
Weathersealed bodyWaterproof body (10m)
650 shots per battery charge240 shots per battery charge
156 x 117 x 123 mm, 1550 g 59 x 41 x 35 mm, 132 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 Cyber-shot DSC-RX0II? 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 RX0 II. 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 dimensions are rounded to the nearest millimeter.

Size Pentax 645Z vs Sony RX0 II
Compare 645Z versus RX0 II top
Comparison 645Z or RX0 II rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony RX0 II is considerably smaller (87 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. More than that, the RX0 II is water-proof up to 10m and can, thus, be used for underwater photography.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the RX0 II 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 Pentax D-LI90 battery, while the RX0 II can take 240 images on a single charge of its Sony NP-BJ1 power pack. The power pack in the RX0 II 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. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499ebay.com
2.
 
Sony RX0 II 59 mm 41 mm 35 mm 132 g 240 Y Mar 2019 699 amazon.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 D4S 160 mm 157 mm 91 mm 1350 g 3020 Y Feb 2014 6,499ebay.com
10.
 
Nikon D5 160 mm 159 mm 92 mm 1415 g 3780 Y Jan 2016 6,499ebay.com
11.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199ebay.com
12.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.com
13.
 
Sony RX0 59 mm 41 mm 30 mm 110 g 240 Y Aug 2017 699ebay.com
14.
 
Sony RX10 II 129 mm 88 mm 102 mm 813 g 400 Y Jun 2015 1,299ebay.com
15.
 
Sony RX10 III 133 mm 94 mm 127 mm 1051 g 420 Y Mar 2016 1,499ebay.com
16.
 
Sony RX10 IV 133 mm 94 mm 145 mm 1095 g 400 Y Sep 2017 1,699 amazon.com
17.
 
Sony ZV-1 105 mm 60 mm 44 mm 294 g 260 n May 2020 799ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The RX0 II was launched at a lower price than the 645Z, despite having a lens built in. 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.

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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Pentax 645Z features a medium format sensor and the Sony RX0 II an one-inch sensor. The sensor area in the RX0 II 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 RX0 II offers a 3:2 aspect.

Pentax 645Z and Sony RX0 II sensor measures

With 51.1MP, the 645Z offers a higher resolution than the RX0 II (15.4MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 2.74μm for the RX0 II) due to its larger sensor. However, the RX0 II is a much more recent model (by 4 years and 11 months) than the 645Z, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that 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 RX0 II are 24 x 16 inches or 61 x 40.6 cm for good quality, 19.2 x 12.8 inches or 48.8 x 32.5 cm for very good quality, and 16 x 10.7 inches or 40.6 x 27.1 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-RX0II are ISO 80 to ISO 12800 (no boost).

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 RX0 II MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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Sensor Characteristics
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
2.
 
Sony RX0 II 1-inch 15.4 4800 32004K/30p22.112.455565
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 D4S Full Frame 16.2 4928 32801080/60p24.413.3307489
10.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
11.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
12.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
13.
 
Sony RX0 1-inch 15.4 4800 32001080/60p22.412.454868
14.
 
Sony RX10 II 1-inch 20.0 5472 36484K/30p23.012.653170
15.
 
Sony RX10 III 1-inch 20.0 5472 36484K/30p23.112.647270
16.
 
Sony RX10 IV 1-inch 20.0 5472 36484K/30p22.012.240863
17.
 
Sony ZV-1 1-inch 20.0 5472 36484K/30p22.212.666966
Note: DXO values in italics represent estimates based on sensor size and age.

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 RX0 II 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 645Z has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the RX0 II relies on live view and the rear LCD for framing. The adjacent table lists some of the other core features of the Pentax 645Z and Sony RX0 II along with similar information for a selection of comparators.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
2.
 
Sony RX0 IInone n1.5 / 230 tilting n .. 5.5/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 D4Soptical Y3.2 / 921 fixed n 1/8000s 11.0/s n n
10.
 
Nikon D5optical Y3.2 / 2359 fixed Y 1/8000s 14.0/s n n
11.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
12.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
13.
 
Sony RX0none n1.5 / 230 fixed n .. 5.5/s n n
14.
 
Sony RX10 II2359 Y3.0 / 1229 tilting n 1/3200s 14.0/s Y Y
15.
 
Sony RX10 III2359 Y3.0 / 1229 tilting n 1/2000s 14.0/s Y Y
16.
 
Sony RX10 IV2359 Y3.0 / 1440 tilting Y 1/2000s 24.0/s Y Y
17.
 
Sony ZV-1none n3.0 / 922 swivel Y 1/2000s 24.0/s n n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the 645Z, but is missing on the RX0 II 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 RX0 II has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the 645Z does not have a selfie-screen.

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 RX0 II only has 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 RX0 II uses micro SDXC or Memory Stick Micro cards. The 645Z features dual card slots, which can be very useful in case a memory card fails. In contrast, the RX0 II 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 Cyber-shot DSC-RX0II and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax 645ZYstereo / monoY-mini3.0---
2.
 
Sony RX0 II-stereo / monoY-micro2.0Y-Y
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 D4SYmono / monoYYmini2.0---
10.
 
Nikon D5Ystereo / monoYYmini3.0---
11.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
12.
 
Pentax 645DYstereo / ----2.0---
13.
 
Sony RX0-stereo / monoY-micro2.0Y-Y
14.
 
Sony RX10 IIYstereo / monoYYmicro2.0YY-
15.
 
Sony RX10 IIIYstereo / monoYYmicro2.0YY-
16.
 
Sony RX10 IVYstereo / monoYYmicro2.0YY-
17.
 
Sony ZV-1Ystereo / monoY-micro2.0Y-Y

It is notable that the 645Z has a hotshoe, while the RX0 II does not. This socket makes it possible to easily attach optional accessories, such as an external flash gun.

Studio photographers will appreciate that the Pentax 645Z (unlike the RX0 II) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The RX0 II is a recent model that features in the current product line-up of Sony. In contrast, the 645Z has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the 645Z from Pentax. Further information on the features and operation of the 645Z and RX0 II can be found, respectively, in the Pentax 645Z Manual (free pdf) or the online Sony RX0 II Manual.

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Review summary

So how do things add up? Is there a clear favorite between the Pentax 645Z and the Sony RX0 II? Which camera is better? 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 15.4MP) with a 79% higher linear resolution.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 1.5") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1037k vs 230k dots).
  • 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 240) on a single battery charge.
  • Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
  • 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 available for much longer (launched in April 2014).

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Arguments in favor of the Sony Cyber-shot DSC-RX0II:

  • 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).
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (5.5 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 (59x41mm 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.
  • Water-proof: Is rugged and sealed and can thus be used for underwater photography (up to 10m).
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • More affordable: Was introduced at a lower price, despite coming with a built-in lens.
  • More modern: Reflects 4 years and 11 months of technical progress since the 645Z launch.

If the count of individual advantages (bullet points above) is taken as a guide, the match-up finishes in a tie (14 points each). 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 wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

645Z 14:14 RX0 II

How about other alternatives? Do the specifications of the Pentax 645Z and the Sony RX0 II place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Prime Lens Compact 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 RX0 II 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
  empty  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 RX0 II........3.5/54/5 Mar 2019 699 amazon.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 D4S5/5......4.5/54.5/5 Feb 2014 6,499ebay.com
10.
 
Nikon D5....4/589/1004.5/55/5 Jan 2016 6,499ebay.com
11.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199ebay.com
12.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
13.
 
Sony RX0........3.5/54/5 Aug 2017 699ebay.com
14.
 
Sony RX10 II5/5+ +..82/1004.5/54/5 Jun 2015 1,299ebay.com
15.
 
Sony RX10 III5/5+..84/1004.5/54.5/5 Mar 2016 1,499ebay.com
16.
 
Sony RX10 IV5/5+3.5/584/1004.5/55/5 Sep 2017 1,699 amazon.com
17.
 
Sony ZV-14/5+4/585/1004/54.5/5 May 2020 799ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Thus, a score needs to be put into the context of the launch date and the launch price 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? In case you are interested in seeing how other cameras pair up, just make a corresponding selection in the search boxes 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 RX0 II

    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 RX0 II
    Camera Type Digital single lens reflex Fixed lens compact camera
    Camera Lens Pentax 645 mount lenses 24mm f/4.0
    Launch Date April 2014 March 2019
    Launch Price USD 8,499 USD 699
    Sensor Specs Pentax 645Z Sony RX0 II
    Sensor Technology CMOS 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 15.4 Megapixels
    Image Resolution 8256 x 6192 pixels 4800 x 3200 pixels
    Pixel Pitch 5.30 μm 2.74 μm
    Pixel Density 3.56 MP/cm2 13.22 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 1080/60i Video 4K/30p Video
    ISO Setting 100 - 204,800 ISO 80 - 12,800 ISO
    Image Processor PRIME III BIONZ X
    DXO Sensor Quality (score) 101 ..
    DXO Color Depth (bits) 26.0 ..
    DXO Dynamic Range (EV) 14.7 ..
    DXO Low Light (ISO) 4505 ..
    Screen Specs Pentax 645Z Sony RX0 II
    Viewfinder Type Optical viewfinder no viewfinder
    Viewfinder Field of View 98%
    Viewfinder Magnification 0.78x
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.2inch 1.5inch
    LCD Resolution 1037k dots 230k dots
    LCD Attachment Tilting screen Tilting screen
    Shooting Specs Pentax 645Z Sony RX0 II
    Focus System Phase-detect AF Contrast-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s ..
    Continuous Shooting 3 shutter flaps/s 5.5 shutter flaps/s
    Electronic Shutterno E-Shutterup to 1/32000s
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards mMS or mSDXC cards
    Single or Dual Card Slots Dual card slots Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Pentax 645Z Sony RX0 II
    External Flash Hotshoe no 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
    Wifi Support no Wifi Wifi built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Pentax 645Z Sony RX0 II
    Environmental SealingWeathersealed bodyWaterproof body (10m)
    Battery Type Pentax D-LI90 Sony NP-BJ1
    Battery Life (CIPA)650 shots per charge240 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)
    59 x 41 x 35 mm
    (2.3 x 1.6 x 1.4 in)
    Camera Weight 1550 g (54.7 oz) 132 g (4.7 oz)
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    Check 645Z offers at
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    Check RX0 II price at
    amazon.com

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