Pentax 645D vs Sony RX10 IV
The Pentax 645D and the Sony Cyber-shot DSC-RX10 IV are two digital cameras that were revealed to the public, respectively, in March 2010 and September 2017. The 645D is a DSLR, while the RX10 IV is a fixed lens compact. The cameras are based on a medium format (645D) and an one-inch (RX10 IV) sensor. The Pentax has a resolution of 39.5 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.
Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645D 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.
An illustration of the physical size and weight of the Pentax 645D and the Sony RX10 IV is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.
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 645D. 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 645D 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 645D gets 800 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 adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|1.||Pentax 645D||156 mm||117 mm||119 mm||1480 g||800||Y||Mar 2010||9,995|
|2.||Sony RX10 IV||133 mm||94 mm||145 mm||1095 g||400||Y||Sep 2017||1,699|
|3.||Canon 1D X Mark II||158 mm||168 mm||83 mm||1530 g||1210||Y||Feb 2016||5,999|
|4.||Canon 1D X||158 mm||168 mm||83 mm||1551 g||1120||Y||Oct 2011||6,799|
|5.||Canon 1D Mark IV||156 mm||157 mm||80 mm||1230 g||1500||Y||Oct 2009||4,999|
|6.||Leica S Typ 006||160 mm||120 mm||80 mm||1260 g||..||Y||Sep 2012||21,950|
|7.||Nikon D850||146 mm||124 mm||79 mm||1005 g||1840||Y||Jul 2017||3,299|
|8.||Nikon D5||160 mm||159 mm||92 mm||1415 g||3780||Y||Jan 2016||6,499|
|9.||Nikon D810||146 mm||123 mm||82 mm||980 g||1200||Y||Jun 2014||3,299|
|10.||Nikon D3S||160 mm||157 mm||88 mm||1240 g||4200||Y||Oct 2009||5,199|
|11.||Pentax 645Z||156 mm||117 mm||123 mm||1550 g||650||Y||Apr 2014||8,499|
|12.||Sony RX100 VI||102 mm||58 mm||43 mm||301 g||240||n||Jun 2018||1,199|
|13.||Sony RX10 III||133 mm||94 mm||127 mm||1051 g||420||Y||Mar 2016||1,499|
|14.||Sony RX100 V||102 mm||58 mm||41 mm||299 g||220||n||Oct 2016||999|
|15.||Sony RX10 II||129 mm||88 mm||102 mm||813 g||400||Y||Jun 2015||1,299|
|16.||Sony A7R||127 mm||94 mm||48 mm||465 g||340||Y||Oct 2013||2,299|
|17.||Sony RX10||129 mm||88 mm||102 mm||813 g||420||Y||Oct 2013||1,299|
|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 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 645D, 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.
The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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. 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 associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the Pentax 645D 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 645D has a native 4:3 aspect ratio, while the one in the RX10 IV offers a 3:2 aspect.
With 39.5MP, the 645D offers a higher resolution than the RX10 IV (20MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 2.41μm for the RX10 IV) due to its larger sensor. However, the RX10 IV is a much more recent model (by 7 years and 6 months) than the 645D, 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 645D has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The resolution advantage of the Pentax 645D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645D for good quality output (200 dots per inch) amounts to 36.3 x 27.2 inches or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inches or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inches or 61.5 x 46.1 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 645D has a native sensitivity range from ISO 100 to ISO 1600. 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.
For many cameras, data on sensor performance has been reported by DXO Mark. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.
|1.||Pentax 645D||Medium Format||39.5||7264||5440||none||24.6||12.6||1262||82|
|2.||Sony RX10 IV||1-inch||20.0||5472||3648||4K/30p||22.0||12.2||408||63|
|3.||Canon 1D X Mark II||Full Frame||20.0||5472||3648||4K/60p||24.1||13.5||3207||88|
|4.||Canon 1D X||Full Frame||17.9||5184||3456||1080/30p||23.8||11.8||2786||82|
|5.||Canon 1D Mark IV||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74|
|6.||Leica S Typ 006||Medium Format||37.5||7500||5000||none||23.9||12.2||824||76|
|7.||Nikon D850||Full Frame||45.4||8256||5504||4K/30p||26.4||14.8||2660||100|
|8.||Nikon D5||Full Frame||20.7||5588||3712||4K/30p||25.1||12.3||2343||88|
|9.||Nikon D810||Full Frame||36.2||7360||4912||1080/60p||25.7||14.8||2853||97|
|10.||Nikon D3S||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82|
|11.||Pentax 645Z||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101|
|12.||Sony RX100 VI||1-inch||20.0||5472||3648||4K/30p||22.1||12.3||478||64|
|13.||Sony RX10 III||1-inch||20.0||5472||3648||4K/30p||23.1||12.6||472||70|
|14.||Sony RX100 V||1-inch||20.0||5472||3648||4K/30p||22.8||12.4||586||70|
|15.||Sony RX10 II||1-inch||20.0||5472||3648||4K/30p||23.0||12.6||531||70|
|16.||Sony A7R||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
|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. The RX10 IV indeed provides for movie recording, while the 645D does not. The highest resolution format that the RX10 IV can use is 4K/30p.
Beyond 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 645D 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 645D (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645D 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 645D, the Sony RX10 IV, and comparable cameras.
|1.||Pentax 645D||optical||Y||3.0 / 921||fixed||n||1/4000s||1.1/s||n||n|
|2.||Sony RX10 IV||2359||Y||3.0 / 1440||tilting||Y||1/2000s||24.0/s||Y||Y|
|3.||Canon 1D X Mark II||optical||Y||3.2 / 1620||fixed||Y||1/8000s||16.0/s||n||n|
|4.||Canon 1D X||optical||Y||3.2 / 1040||fixed||n||1/8000s||14.0/s||n||n|
|5.||Canon 1D Mark IV||optical||Y||3.0 / 920||fixed||n||1/8000s||10.0/s||n||n|
|6.||Leica S Typ 006||optical||Y||3.0 / 922||fixed||n||1/4000s||1.5/s||n||n|
|7.||Nikon D850||optical||Y||3.2 / 2359||tilting||Y||1/8000s||9.0/s||n||n|
|8.||Nikon D5||optical||Y||3.2 / 2359||fixed||Y||1/8000s||14.0/s||n||n|
|9.||Nikon D810||optical||Y||3.2 / 1229||fixed||n||1/8000s||5.0/s||Y||n|
|10.||Nikon D3S||optical||Y||3.0 / 921||fixed||n||1/8000s||11.0/s||n||n|
|11.||Pentax 645Z||optical||Y||3.2 / 1037||tilting||n||1/4000s||3.0/s||n||n|
|12.||Sony RX100 VI||2359||n||3.0 / 1229||tilting||Y||1/2000s||24.0/s||Y||Y|
|13.||Sony RX10 III||2359||Y||3.0 / 1229||tilting||n||1/2000s||14.0/s||Y||Y|
|14.||Sony RX100 V||2359||n||3.0 / 1229||tilting||n||1/2000s||24.0/s||Y||Y|
|15.||Sony RX10 II||2359||Y||3.0 / 1229||tilting||n||1/3200s||14.0/s||Y||Y|
|16.||Sony A7R||2400||n||3.0 / 1230||tilting||n||1/8000s||4.0/s||n||n|
|17.||Sony RX10||1440||Y||3.0 / 1229||tilting||n||1/3200s||10.0/s||Y||Y|
|Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.|
One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The RX10 IV has a touchscreen, while the 645D 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 645D 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 645D writes its imaging data to SDXC cards, while the RX10 IV uses SDXC or Memory Stick PRO Duo cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the RX10 IV only has one slot. The RX10 IV supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the 645D cannot take advantage of Ultra High Speed SD cards.
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 645D and Sony Cyber-shot DSC-RX10 IV and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Pentax 645D||Y||stereo / -||-||-||-||2.0||-||-||-|
|2.||Sony RX10 IV||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|3.||Canon 1D X Mark II||Y||mono / mono||Y||Y||mini||3.0||-||-||-|
|4.||Canon 1D X||Y||mono / -||Y||-||mini||2.0||-||-||-|
|5.||Canon 1D Mark IV||Y||stereo / -||Y||-||mini||2.0||-||-||-|
|6.||Leica S Typ 006||Y||- / -||-||-||mini||2.0||-||-||-|
|7.||Nikon D850||Y||stereo / mono||Y||Y||mini||3.0||Y||Y||Y|
|8.||Nikon D5||Y||stereo / mono||Y||Y||mini||3.0||-||-||-|
|9.||Nikon D810||Y||stereo / mono||Y||Y||mini||3.0||Y||-||-|
|10.||Nikon D3S||Y||stereo / -||-||-||mini||2.0||-||-||-|
|11.||Pentax 645Z||Y||stereo / mono||Y||-||mini||3.0||-||-||-|
|12.||Sony RX100 VI||-||stereo / mono||-||-||micro||2.0||Y||Y||Y|
|13.||Sony RX10 III||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|14.||Sony RX100 V||-||stereo / mono||-||-||micro||2.0||Y||Y||-|
|15.||Sony RX10 II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|16.||Sony A7R||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|17.||Sony RX10||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
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 645D does not provide wifi capability.
Studio photographers will appreciate that the Pentax 645D (unlike the RX10 IV) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
The RX10 IV is a recent model that features in the current product line-up of Sony. In contrast, the 645D has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the 645D was succeeded by the Pentax 645Z. 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.
So what is the bottom line? Is there a clear favorite between the Pentax 645D and the Sony RX10 IV? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.
Arguments in favor of the Pentax 645D:
- More detail: Offers more megapixels (39.5 vs 20MP) with a 38% 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).
- 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 (800 versus 400) on a single battery charge.
- 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 March 2010).
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.
- Broader imaging potential: Can capture not only stills but also 4K/30p video.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- 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 921k dots).
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster burst: Shoots at higher frequency (24 vs 1.1 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 645D 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 645D).
- 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.
- Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
- More affordable: Was introduced at a lower price, despite coming with a built-in lens.
- More modern: Reflects 7 years and 6 months of technical progress since the 645D launch.
If the number of relative strengths (bullet points above) is taken as a guide, the RX10 IV is the clear winner of the contest (21 : 11 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Pentax 645D 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 comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 645D or the RX10 IV. 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.
This is why hands-on reviews by experts are important. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], 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.
|1.||Pentax 645D||5/5||..||..||..||..||..||Mar 2010||9,995|
|2.||Sony RX10 IV||5/5||+||..||84/100||4.5/5||5/5||Sep 2017||1,699|
|3.||Canon 1D X Mark II||..||..||4.5/5||89/100||4.5/5||4.5/5||Feb 2016||5,999|
|4.||Canon 1D X||5/5||..||..||..||4.5/5||4.5/5||Oct 2011||6,799|
|5.||Canon 1D Mark IV||5/5||..||..||89/100||..||..||Oct 2009||4,999|
|6.||Leica S Typ 006||..||..||..||..||..||..||Sep 2012||21,950|
|7.||Nikon D850||4.5/5||+ +||5/5||89/100||4.5/5||5/5||Jul 2017||3,299|
|8.||Nikon D5||..||..||4/5||89/100||4.5/5||5/5||Jan 2016||6,499|
|9.||Nikon D810||5/5||..||5/5||86/100||5/5||4.5/5||Jun 2014||3,299|
|10.||Nikon D3S||5/5||..||..||89/100||4.5/5||5/5||Oct 2009||5,199|
|11.||Pentax 645Z||5/5||..||..||..||4.5/5||5/5||Apr 2014||8,499|
|12.||Sony RX100 VI||4.5/5||+ +||..||83/100||4/5||4.5/5||Jun 2018||1,199|
|13.||Sony RX10 III||5/5||+||..||84/100||4.5/5||4.5/5||Mar 2016||1,499|
|14.||Sony RX100 V||4.5/5||+ +||..||83/100||4/5||4.5/5||Oct 2016||999|
|15.||Sony RX10 II||5/5||+ +||..||82/100||4.5/5||4/5||Jun 2015||1,299|
|16.||Sony A7R||5/5||+ +||..||82/100||4.5/5||5/5||Oct 2013||2,299|
|17.||Sony RX10||5/5||+||..||80/100||4.5/5||4.5/5||Oct 2013||1,299|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.
Other camera comparisons
Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, 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.
- Canon 100D vs Pentax 645D
- Canon 1D Mark IV vs Sony RX10 IV
- Canon 750D vs Pentax 645D
- Canon G9 X Mark II vs Sony RX10 IV
- Canon T3i vs Sony RX10 IV
- Nikon 1 J4 vs Pentax 645D
- Nikon D40X vs Pentax 645D
- Olympus E-450 vs Sony RX10 IV
- Olympus E-P5 vs Sony RX10 IV
- Panasonic G3 vs Pentax 645D
- Panasonic G7 vs Sony RX10 IV
- Panasonic GM1 vs Pentax 645D
Specifications: Pentax 645D 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 Model||Pentax 645D||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||March 2010||September 2017|
|Launch Price||USD 9,995||USD 1,699|
|Sensor Specs||Pentax 645D||Sony RX10 IV|
|Sensor Format||Medium Format Sensor||1" Sensor|
|Sensor Size||44.0 x 33.0 mm||13.2 x 8.8 mm|
|Sensor Area||1452 mm2||116.16 mm2|
|Sensor Diagonal||55 mm||15.9 mm|
|Sensor Resolution||39.5 Megapixels||20 Megapixels|
|Image Resolution||7264 x 5440 pixels||5472 x 3648 pixels|
|Pixel Pitch||6.06 μm||2.41 μm|
|Pixel Density||2.72 MP/cm2||17.18 MP/cm2|
|Moiré control||no AA filter||Anti-Alias filter|
|Movie Capability||no Video||4K/30p Video|
|ISO Setting||100 - 1,600 ISO||100 - 12,800 ISO|
|ISO Boost||no Enhancement||64 - 25,600 ISO|
|Image Processor||PRIME II||BIONZ X|
|DXO Sensor Quality (score)||82||..|
|DXO Color Depth (bits)||24.6||..|
|DXO Dynamic Range (EV)||12.6||..|
|DXO Low Light (ISO)||1262||..|
|Screen Specs||Pentax 645D||Sony RX10 IV|
|Viewfinder Type||Optical viewfinder||Electronic viewfinder|
|Viewfinder Field of View||98%||100%|
|Viewfinder Resolution||2359k dots|
|Top-Level Screen||Control Panel||Control Panel|
|LCD Framing||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||921k dots||1440k dots|
|LCD Attachment||Fixed screen||Tilting screen|
|Touch Input||no Touchscreen||Touchscreen|
|Shooting Specs||Pentax 645D||Sony RX10 IV|
|Focus System||Phase-detect AF||On-Sensor Phase-detect|
|Manual Focusing Aid||no Peaking Feature||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000s||1/2000s|
|Continuous Shooting||1.1 shutter flaps/s||24 shutter flaps/s|
|Electronic Shutter||no E-Shutter||up to 1/32000s|
|Time-Lapse Photography||Intervalometer built-in||no 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||no||UHS-I|
|Connectivity Specs||Pentax 645D||Sony RX10 IV|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||no HDMI||micro HDMI|
|Microphone Port||no MIC socket||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 645D||Sony RX10 IV|
|Environmental Sealing||Weathersealed body||Weathersealed body|
|Battery Life (CIPA)||800 shots per charge||400 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
156 x 117 x 119 mm
(6.1 x 4.6 x 4.7 in)
133 x 94 x 145 mm
(5.2 x 3.7 x 5.7 in)
|Camera Weight||1480 g (52.2 oz)||1095 g (38.6 oz)|
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