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Pentax 645Z vs Sony RX10 IV

The Pentax 645Z and the Sony Cyber-shot DSC-RX10 IV are two digital cameras that were officially introduced, respectively, in April 2014 and September 2017. The 645Z is a DSLR, while the RX10 IV is a fixed lens compact. The cameras are based on a medium format (645Z) and an one-inch (RX10 IV) 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 IV
Pentax 645Z Sony RX10 IV
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, 1440k dots
Tilting screen (no touchscreen) Tilting touchscreen
3 shutter flaps per second 24 shutter flaps per second
Weathersealed bodyWeathersealed body
650 shots per battery charge400 shots per battery charge
156 x 117 x 123 mm, 1550 g 133 x 94 x 145 mm, 1095 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 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 RX10 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 RX10 IV
Compare 645Z versus RX10 IV top
Comparison 645Z or RX10 IV rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony RX10 IV 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 IV 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 IV can take 400 images on a single charge of its NP-FW50 power pack. The power pack in the RX10 IV 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, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.

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Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life 1
Weather
Sealing
Camera
Launch 2
Launch
Price (USD)
Street
Price
 
Pentax 645Z 6.1 in 4.6 in 4.8 in 54.7 oz 650 Y Apr 2014 8,499 i
 
Sony RX10 IV 5.2 in 3.7 in 5.7 in 38.6 oz 400 Y Sep 2017 1,699 i
 
Canon 1D X Mark II 6.2 in 6.6 in 3.3 in 54.0 oz 1210 Y Feb 2016 5,999i
 
Canon 5DS 6.0 in 4.6 in 3.0 in 32.8 oz 700 Y Feb 2015 3,699 i
 
Canon 5DS R 6.0 in 4.6 in 3.0 in 32.8 oz 700 Y Feb 2015 3,699 i
 
Hasselblad X1D 5.9 in 3.9 in 2.8 in 25.6 oz .. Y Jun 2016 8,995i
 
Leica SL 5.8 in 4.1 in 1.5 in 29.9 oz 400 Y Oct 2015 7,450i
 
Nikon D850 5.7 in 4.9 in 3.1 in 35.5 oz 1840 Y Jul 2017 3,299 i
 
Nikon D5 6.3 in 6.3 in 3.6 in 49.9 oz 3780 Y Jan 2016 6,499i
 
Nikon D7200 5.4 in 4.2 in 3.0 in 27.0 oz 1110 Y Mar 2015 1,199i
 
Nikon D4S 6.3 in 6.2 in 3.6 in 47.6 oz 3020 Y Feb 2014 6,499i
 
Pentax 645D 6.1 in 4.6 in 4.7 in 52.2 oz 800 Y Mar 2010 9,995i
 
Sony RX100 VI 4.0 in 2.3 in 1.7 in 10.6 oz 240 n Jun 2018 1,199i
 
Sony RX10 III 5.2 in 3.7 in 5.0 in 37.1 oz 420 Y Mar 2016 1,499 i
 
Sony RX100 V 4.0 in 2.3 in 1.6 in 10.5 oz 220 n Oct 2016 999 i
 
Sony RX10 II 5.1 in 3.5 in 4.0 in 28.7 oz 400 Y Jun 2015 1,299i
 
Sony RX10 5.1 in 3.5 in 4.0 in 28.7 oz 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.
(1) Number of images that can be taken on a full battery charge according to the CIPA-standard; (2) Official announcement.

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 IV 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 IV an one-inch sensor. The sensor area in the RX10 IV 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 IV offers a 3:2 aspect.

Pentax 645Z and Sony RX10 IV sensor measures

With 51.1MP, the 645Z offers a higher resolution than the RX10 IV (20MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 2.41μm for the RX10 IV) due to its larger sensor. However, the RX10 IV is a much more recent model (by 3 years and 4 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 RX10 IV 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 RX10 IV 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 Cyber-shot DSC-RX10 IV are ISO 100 to ISO 12800, with the possibility to increase the ISO range to 64-25600.

645Z versus RX10 IV 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"). 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
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
 
Sony RX10 IV 1-inch 20.0 5472 36484K/30p........
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.5320788
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.4230886
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660100
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
 
Nikon D4S Full Frame 16.2 4928 32801080/60p24.413.3307489
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
 
Sony RX100 VI 1-inch 20.0 5472 36484K/30p........
 
Sony RX10 III 1-inch 20.0 5472 36484K/30p23.112.647270
 
Sony RX100 V 1-inch 20.0 5472 36484K/30p22.812.458670
 
Sony RX10 II 1-inch 20.0 5472 36484K/30p23.012.653170
 
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 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.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the RX10 IV 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 IV 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 IV, and comparable 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
 
Pentax 645Zoptical Y 3.2 1037 tilting n 1/4000s 3.0 n n
 
Sony RX10 IV2359 Y 3.0 1440 tilting Y 1/2000s 24.0 Y Y
 
Canon 1D X Mark IIoptical Y 3.2 1620 fixed Y 1/8000s 16.0 n n
 
Canon 5DSoptical Y 3.2 1040 fixed n 1/8000s 5.0 n n
 
Canon 5DS Roptical Y 3.2 1040 fixed n 1/8000s 5.0 n n
 
Hasselblad X1D2360 n 3.0 920 fixed Y 1/2000s 2.3 n n
 
Leica SL4400 Y 3.0 1040 fixed Y 1/8000s 11.0 n n
 
Nikon D850optical Y 3.2 2359 tilting Y 1/8000s 9.0 n n
 
Nikon D5optical Y 3.2 2359 fixed Y 1/8000s 14.0 n n
 
Nikon D7200optical Y 3.2 1229 fixed n 1/8000s 6.0 Y n
 
Nikon D4Soptical Y 3.2 921 fixed n 1/8000s 11.0 n n
 
Pentax 645Doptical Y 3.0 921 fixed n 1/4000s 1.1 n n
 
Sony RX100 VI2359 n 3.0 1229 tilting Y 1/2000s 24.0 Y Y
 
Sony RX10 III2359 Y 3.0 1229 tilting n 1/2000s 14.0 Y Y
 
Sony RX100 V2359 n 3.0 1229 tilting n 1/2000s 24.0 Y Y
 
Sony RX10 II2359 Y 3.0 1229 tilting n 1/3200s 14.0 Y Y
 
Sony RX101440 Y 3.0 1229 tilting n 1/3200s 10.0 Y Y

One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The RX10 IV has a touchscreen, while the 645Z has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

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 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 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 IV 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 IV 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 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
 
Pentax 645ZYstereomonoY-mini3.0---
 
Sony RX10 IVYstereomonoYYmicro2.0YY-
 
Canon 1D X Mark IIYmonomonoYYmini3.0---
 
Canon 5DSYmonomonoY-mini3.0---
 
Canon 5DS RYmonomonoY-mini3.0---
 
Hasselblad X1DYstereomonoYYmini3.0Y--
 
Leica SLYstereomonoYYfull3.0Y--
 
Nikon D850YstereomonoYYmini3.0YYY
 
Nikon D5YstereomonoYYmini3.0---
 
Nikon D7200YstereomonoYYmini2.0YY-
 
Nikon D4SYmonomonoYYmini2.0---
 
Pentax 645DYstereo----2.0---
 
Sony RX100 VI-stereomono--micro2.0YYY
 
Sony RX10 IIIYstereomonoYYmicro2.0YY-
 
Sony RX100 V-stereomono--micro2.0YY-
 
Sony RX10 IIYstereomonoYYmicro2.0YY-
 
Sony RX10YstereomonoYYmicro2.0YY-

It is notable that the RX10 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.

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

Both the 645Z and the RX10 IV are recent models that are part of the current product line-up. The 645Z replaced the earlier Pentax 645D, while the RX10 IV followed on from the Sony RX10 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.

Review summary

So what conclusions can be drawn? Is there a clear favorite between the Pentax 645Z and the Sony RX10 IV? 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.
  • 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 400) 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 available for much longer (launched in April 2014).

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

  • 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 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 burst: Shoots at higher frequency (24 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: Reflects 3 years and 4 months of technical progress since the 645Z launch.

If the count of relative strengths (bullet points above) is taken as a measure, the RX10 IV is the clear winner of the contest (19 : 13 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 13:19 RX10 IV

How about other alternatives? Do the specifications of the Pentax 645Z and the Sony RX10 IV 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 IV 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 (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.

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Review Scores
  Camera
Model
camera
  labs  
dp
review  
ephoto
  zine  
imaging
resource
photography
  blog  
Camera
Launch
Launch
Price (USD)
Street
Price
 
Pentax 645Z....4.5/55/55/5 Apr 2014 8,499 i
 
Sony RX10 IV+84/1004.5/5..5/5 Sep 2017 1,699 i
 
Canon 1D X Mark II..89/1004.5/55/54.5/5 Feb 2016 5,999i
 
Canon 5DS+83/1004.5/55/54.5/5 Feb 2015 3,699 i
 
Canon 5DS R+83/1005/55/54.5/5 Feb 2015 3,699 i
 
Hasselblad X1Do81/100....4/5 Jun 2016 8,995i
 
Leica SL..84/1004.5/54/54/5 Oct 2015 7,450i
 
Nikon D850+ +89/1004.5/55/55/5 Jul 2017 3,299 i
 
Nikon D5..89/1004.5/55/55/5 Jan 2016 6,499i
 
Nikon D7200+ +84/1004.5/54/54.5/5 Mar 2015 1,199i
 
Nikon D4S....4.5/55/54.5/5 Feb 2014 6,499i
 
Pentax 645D......4.5/5.. Mar 2010 9,995i
 
Sony RX100 VI+ +83/1004/5..4.5/5 Jun 2018 1,199i
 
Sony RX10 III+84/1004.5/54.5/54.5/5 Mar 2016 1,499 i
 
Sony RX100 V+ +83/1004/55/54.5/5 Oct 2016 999 i
 
Sony RX10 II+ +82/1004.5/54.5/54/5 Jun 2015 1,299i
 
Sony RX10+80/1004.5/54.5/54.5/5 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 IV:
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.

~

    Specifications: Pentax 645Z vs Sony RX10 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 RX10 IV
    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 September 2017
    Launch Price USD 8,499 USD 1,699
    Sensor Specs Pentax 645Z Sony RX10 IV
    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 ..
    DXO Color Depth (bits) 26.0 ..
    DXO Dynamic Range (EV) 14.7 ..
    DXO Low Light (ISO) 4505 ..
    Screen Specs Pentax 645Z Sony RX10 IV
    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 1440k dots
    LCD Attachment Tilting screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax 645Z Sony RX10 IV
    Focus System Phase-detect AF On-Sensor Phase-detect
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/2000s
    Continuous Shooting 3 shutter flaps/s 24 shutter flaps/s
    Electronic Shutterno E-Shutterup to 1/32000s
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Fill Flash no On-Board Flash Build-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 IV
    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 IV
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type D-LI90 NP-FW50
    Battery Life (CIPA)650 shots per charge400 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 145 mm
    (5.2 x 3.7 x 5.7 in)
    Camera Weight 1550 g (54.7 oz) 1095 g (38.6 oz)

    Did you notice an error on this page? If so, please get in touch, so that we can correct the information.

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