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Pentax 645D vs Sony A99 II

The Pentax 645D and the Sony Alpha ALT-A99 II are two professional cameras that were announced, respectively, in March 2010 and September 2016. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a medium format (645D) and a full frame (A99 II) sensor. The Pentax has a resolution of 39.5 megapixels, whereas the Sony provides 42.2 MP.

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

Headline Specifications
Pentax 645D   Sony A99 II
Pentax 645D Sony A99 II
Digital single lens reflex Digital single lens reflex
Pentax 645 mount lenses Sony A mount lenses
39.5 MP, Medium Format Sensor 42.2 MP, Full Frame Sensor
no Video 4K/30p Video
ISO 100-1600 ISO 100-25600
Optical viewfinder Electronic viewfinder (2400k dots)
3.0" LCD, 921k dots 3.0" LCD, 1229k dots
Fixed screen (not touch-sensitive) Fully flexible screen (no touchscreen)
1.1 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
Weathersealed bodyWeathersealed body
800 shots per battery charge490 shots per battery charge
156 x 117 x 119 mm, 1480 g 143 x 104 x 76 mm, 849 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645D and the Sony Alpha ALT-A99 II? 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: Pentax 645D vs Sony A99 II

An illustration of the physical size and weight of the Pentax 645D and the Sony A99 II is provided in the side-by-side display below. 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 645D vs Sony A99 II
Compare 645D versus A99 II top
Comparison 645D or A99 II rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A99 II is notably smaller (19 percent) than the Pentax 645D. Moreover, the A99 II is substantially lighter (43 percent) than the 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 since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the 645D gets 800 shots out of its D-LI90 battery, while the A99 II can take 490 images on a single charge of its NP-FM500H power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. 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.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Pentax 645D» 6.1 in 4.6 in 4.7 in 52.2 oz 800 Y Mar 2010 9,995- i Pentax 645D
 
Sony A99 II« 5.6 in 4.1 in 3.0 in 29.9 oz 490 Y Sep 2016 3,199 i i Sony A99 II
 
Canon 1D X Mark II« » 6.2 in 6.6 in 3.3 in 54.0 oz 1210 Y Feb 2016 5,999 i i Canon 1D X Mark II
 
Canon 1D X« » 6.2 in 6.6 in 3.3 in 54.7 oz 1120 Y Oct 2011 6,799- i Canon 1D X
 
Canon 1D Mark IV« » 6.1 in 6.2 in 3.1 in 43.4 oz 1500 Y Oct 2009 4,999- i Canon 1D Mark IV
 
Leica S Typ 006« » 6.3 in 4.7 in 3.1 in 44.4 oz .. Y Sep 2012 21,950- i Leica S Typ 006
 
Nikon D850« » 5.7 in 4.9 in 3.1 in 35.5 oz 1840 Y Jul 2017 3,299 i i Nikon D850
 
Nikon D5« » 6.3 in 6.3 in 3.6 in 49.9 oz 3780 Y Jan 2016 6,499 i i Nikon D5
 
Nikon D810« » 5.7 in 4.8 in 3.2 in 34.6 oz 1200 Y Jun 2014 3,299- i Nikon D810
 
Nikon D3S« » 6.3 in 6.2 in 3.5 in 43.7 oz 4200 Y Oct 2009 5,199- i Nikon D3S
 
Pentax 645Z« » 6.1 in 4.6 in 4.8 in 54.7 oz 650 Y Apr 2014 8,499 i i Pentax 645Z
 
Sony A7R III« » 5.0 in 3.8 in 2.9 in 22.9 oz 650 Y Oct 2017 3,199 i i Sony A7R III
 
Sony A7R II« » 5.0 in 3.8 in 2.4 in 22.0 oz 290 Y Jun 2015 3,199- i Sony A7R II
 
Sony A7R« » 5.0 in 3.7 in 1.9 in 16.4 oz 340 Y Oct 2013 2,299- i Sony A7R
 
Sony A99« » 5.8 in 4.4 in 3.1 in 28.6 oz 500 Y Sep 2012 2,799- i Sony A99
 
Sony A850« » 6.1 in 4.6 in 3.2 in 31.6 oz 880 Y Aug 2009 1,999- i Sony A850
 
Sony A900« » 6.1 in 4.6 in 3.2 in 31.6 oz 880 Y Sep 2008 2,999- i Sony A900
Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The A99 II was launched at a markedly lower price (by 68 percent) than the 645D, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

 

Sensor comparison: Pentax 645D vs Sony A99 II

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Pentax 645D features a medium format sensor and the Sony A99 II a full frame sensor. The sensor area in the A99 II is 41 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.0. The sensor in the 645D has a native 4:3 aspect ratio, while the one in the A99 II offers a 3:2 aspect.

Pentax 645D and Sony A99 II sensor measures

Despite having a smaller sensor, the A99 II offers a slightly higher resolution of 42.2 megapixels, compared with 39.5 MP of the 645D. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 4.52μm versus 6.06μm for the 645D). However, it should be noted that the A99 II is much more recent (by 6 years and 6 months) than the 645D, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Sony A99 II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A99 II for good quality output (200 dots per inch) amounts to 39.8 x 26.5 inch or 101 x 67.4 cm, for very good quality (250 dpi) 31.8 x 21.2 inch or 80.8 x 53.9 cm, and for excellent quality (300 dpi) 26.5 x 17.7 inch or 67.3 x 44.9 cm. The corresponding values for the Pentax 645D are 36.3 x 27.2 inch or 92.3 x 69.1 cm for good quality, 29.1 x 21.8 inch or 73.8 x 55.3 cm for very good quality, and 24.2 x 18.1 inch or 61.5 x 46.1 cm for excellent quality prints.

The A99 II 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 Alpha ALT-A99 II are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-25600.

645D versus A99 II MP

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"). Of the two cameras under consideration, the A99 II has a markedly higher DXO score than the 645D (overall score 10 points higher), which will translate into better image quality. The advantage is based on 0.8 bits higher color depth, 0.8 EV in additional dynamic range, and 0.9 stops in additional low light sensitivity. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Pentax 645D» Medium Format 39.5 7264 5440-24.612.6126282Pentax 645D
 
Sony A99 II« Full Frame 42.2 7952 53044K/30p25.413.4231792Sony A99 II
 
Canon 1D X Mark II« » Full Frame 20.0 5472 36484K/60p24.113.5320788Canon 1D X Mark II
 
Canon 1D X« » Full Frame 17.9 5184 34561080/30p23.811.8278682Canon 1D X
 
Canon 1D Mark IV« » APS-H 16.0 4896 32641080/30p22.812.0132074Canon 1D Mark IV
 
Leica S Typ 006« » Medium Format 37.5 7500 5000-23.912.282476Leica S Typ 006
 
Nikon D850« » Full Frame 45.4 8256 55044K/30p26.414.82660100Nikon D850
 
Nikon D5« » Full Frame 20.7 5588 37124K/30p25.112.3234388Nikon D5
 
Nikon D810« » Full Frame 36.2 7360 49121080/60p25.714.8285397Nikon D810
 
Nikon D3S« » Full Frame 12.1 4256 2832720/24p23.512.0325382Nikon D3S
 
Pentax 645Z« » Medium Format 51.1 8256 61921080/60i26.014.74505101Pentax 645Z
 
Sony A7R III« » Full Frame 42.2 7952 53044K/30p26.014.73523100Sony A7R III
 
Sony A7R II« » Full Frame 42.2 7952 53044K/30p26.013.9343498Sony A7R II
 
Sony A7R« » Full Frame 36.2 7360 49121080/60p25.614.1274695Sony A7R
 
Sony A99« » Full Frame 24.0 6000 40001080/60p25.014.0155589Sony A99
 
Sony A850« » Full Frame 24.4 6048 4032-23.812.2141579Sony A850
 
Sony A900« » Full Frame 24.4 6048 4032-23.712.3143179Sony A900

Many modern cameras cannot only take still pictures, but also record videos. The A99 II indeed provides for movie recording, while the 645D does not. The highest resolution format that the A99 II can use is 4K/30p.

 

Feature comparison: Pentax 645D vs Sony A99 II

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A99 II has an electronic viewfinder (2400k 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 viewfinders of both cameras offer the same magnification (0.78x), but the one in the A99 II has a wider field of view (100%) than the finder in the 645D (98%), so that a larger proportion of the captured image is visible. The table below summarizes some of the other core capabilities of the Pentax 645D and Sony A99 II in connection with corresponding information for a sample of similar cameras.

Core Features
  Camera
Model
Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
Camera
Model
 
Pentax 645D»optical Y 3.0 921 fixed n 1/4000s 1.1 n n Pentax 645D
 
Sony A99 II«2400 Y 3.0 1229 full-flex n 1/8000s 12.0 n Y Sony A99 II
 
Canon 1D X Mark II« »optical Y 3.2 1620 fixed Y 1/8000s 16.0 n n Canon 1D X Mark II
 
Canon 1D X« »optical Y 3.2 1040 fixed n 1/8000s 14.0 n n Canon 1D X
 
Canon 1D Mark IV« »optical Y 3.0 920 fixed n 1/8000s 10.0 n n Canon 1D Mark IV
 
Leica S Typ 006« »optical Y 3.0 922 fixed n 1/4000s 1.5 n n Leica S Typ 006
 
Nikon D850« »optical Y 3.2 2359 tilting Y 1/8000s 9.0 n n Nikon D850
 
Nikon D5« »optical Y 3.2 2359 fixed Y 1/8000s 14.0 n n Nikon D5
 
Nikon D810« »optical Y 3.2 1229 fixed n 1/8000s 5.0 Y n Nikon D810
 
Nikon D3S« »optical Y 3.0 921 fixed n 1/8000s 11.0 n n Nikon D3S
 
Pentax 645Z« »optical Y 3.2 1037 tilting n 1/4000s 3.0 n n Pentax 645Z
 
Sony A7R III« »3686 n 3.0 1440 tilting Y 1/8000s 10.0 n Y Sony A7R III
 
Sony A7R II« »2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7R II
 
Sony A7R« »2400 n 3.0 1230 tilting n 1/8000s 4.0 n n Sony A7R
 
Sony A99« »2359 Y 3.0 1229 full-flex n 1/8000s 6.0 n Y Sony A99
 
Sony A850« »optical Y 3.0 922 fixed n 1/8000s 3.0 n Y Sony A850
 
Sony A900« »optical Y 3.0 922 fixed n 1/8000s 5.0 n Y Sony A900

One feature that differentiates the A99 II and the 645D is in-body image stabilization (IBIS). The A99 II reduces the risk of handshake-induced blur with all attached lenses, while the 645D has to rely on optical image stabilization in OIS-equipped lenses to achieve the same effect.

The A99 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 645D does not have a selfie-screen.

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 A99 II uses SDXC or Memory Stick PRO Duo cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. The A99 II 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.

 

Connectivity comparison: Pentax 645D vs Sony A99 II

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 Alpha ALT-A99 II and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Type
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
 
Pentax 645D»Ystereo----2.0---Pentax 645D
 
Sony A99 II«YstereomonoYYmicro2.0YYYSony A99 II
 
Canon 1D X Mark II« »YmonomonoYYmini3.0---Canon 1D X Mark II
 
Canon 1D X« »Ymono-Y-mini2.0---Canon 1D X
 
Canon 1D Mark IV« »Ystereo-Y-mini2.0---Canon 1D Mark IV
 
Leica S Typ 006« »Y----mini2.0---Leica S Typ 006
 
Nikon D850« »YstereomonoYYmini3.0YYYNikon D850
 
Nikon D5« »YstereomonoYYmini3.0---Nikon D5
 
Nikon D810« »YstereomonoYYmini3.0Y--Nikon D810
 
Nikon D3S« »Ystereo---mini2.0---Nikon D3S
 
Pentax 645Z« »YstereomonoY-mini3.0---Pentax 645Z
 
Sony A7R III« »YstereomonoYYmicro3.1YYYSony A7R III
 
Sony A7R II« »YstereomonoYYmicro2.0YY-Sony A7R II
 
Sony A7R« »YstereomonoYYmicro2.0YY-Sony A7R
 
Sony A99« »YstereomonoYYmini2.0---Sony A99
 
Sony A850« »Y----mini2.0---Sony A850
 
Sony A900« »Y----mini2.0---Sony A900

It is notable that the A99 II 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 offer wifi capability.

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

The A99 II is a recent model that features in the current product line-up of Sony. In contrast, the 645D has been discontinued (but it 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.


Review summary: Pentax 645D vs Sony A99 II

So what conclusions can be drawn? Is the Pentax 645D better than the Sony A99 II or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Pentax 645D:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Can take more shots (800 versus 490) on a single battery charge.
  • More heavily discounted: Has been available for much longer (launched in March 2010).

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Reasons to prefer the Sony Alpha ALT-A99 II:

  • More detail: Has more megapixels (42.2 vs 39.5MP), which boosts linear resolution by 5%.
  • Better image quality: Scores markedly higher (10 points) in the DXO overall evaluation.
  • More dynamic range: Captures a broader range of light and dark details (0.8 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (0.9 stops ISO advantage).
  • 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 (1229k vs 921k dots).
  • More flexible LCD: Has full-flex screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 1.1 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (143x104mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 631g or 43 percent) and is thus easier to take along.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More affordable: Was introduced into a lower priced category (68 percent cheaper at launch).
  • More modern: Reflects 6 years and 6 months of technical progress since the 645D launch.

If the count of relative strengths (bullet points above) is taken as a measure, the A99 II is the clear winner of the contest (23 : 4 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

645D 04:23 A99 II

How about other alternatives? Do the specifications of the Pentax 645D and the Sony A99 II place the cameras among the top in their class? Find out in the latest Best DSLR Camera listing 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 A99 II. 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: Pentax 645D vs Sony A99 II

This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

Review Scores
  Camera
Model
cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Pentax 645D»---4.5/5- Mar 2010 9,995- i Pentax 645D
 
Sony A99 II«-85/1004.5/54.5/54.5/5 Sep 2016 3,199 i i Sony A99 II
 
Canon 1D X Mark II« »-89/1004.5/55/54.5/5 Feb 2016 5,999 i i Canon 1D X Mark II
 
Canon 1D X« »--4.5/54.5/54.5/5 Oct 2011 6,799- i Canon 1D X
 
Canon 1D Mark IV« »-89/100-5/5- Oct 2009 4,999- i Canon 1D Mark IV
 
Leica S Typ 006« »----- Sep 2012 21,950- i Leica S Typ 006
 
Nikon D850« »+ +89/1004.5/55/55/5 Jul 2017 3,299 i i Nikon D850
 
Nikon D5« »-89/1004.5/55/55/5 Jan 2016 6,499 i i Nikon D5
 
Nikon D810« »-86/1005/54.5/54.5/5 Jun 2014 3,299- i Nikon D810
 
Nikon D3S« »-89/1004.5/55/55/5 Oct 2009 5,199- i Nikon D3S
 
Pentax 645Z« »--4.5/55/55/5 Apr 2014 8,499 i i Pentax 645Z
 
Sony A7R III« »+ +90/1004.5/55/55/5 Oct 2017 3,199 i i Sony A7R III
 
Sony A7R II« »+ +90/1005/54.5/55/5 Jun 2015 3,199- i Sony A7R II
 
Sony A7R« »+ +82/1004.5/55/55/5 Oct 2013 2,299- i Sony A7R
 
Sony A99« »-84/1004.5/5o4.5/5 Sep 2012 2,799- i Sony A99
 
Sony A850« »-75/100-4/54.5/5 Aug 2009 1,999- i Sony A850
 
Sony A900« »+ ++ +4.5/54/55/5 Sep 2008 2,999- i Sony A900
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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

Pentax 645D:
Check Ebay offers
Sony A99 II:
Check Amazon price

Other camera comparisons

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    Specifications: Pentax 645D vs Sony A99 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 645D Sony A99 II
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Pentax 645 mount lenses Sony A mount lenses
    Launch Date March 2010 September 2016
    Launch Price USD 9995 USD 3199
    Sensor Specs Pentax 645D Sony A99 II
    Sensor Technology CCD BSI-CMOS
    Sensor Format Medium Format Sensor Full Frame Sensor
    Sensor Size 44.0 x 33.0 mm 35.9 x 24.0 mm
    Sensor Area 1452 mm2 861.6 mm2
    Sensor Diagonal 55 mm 43.2 mm
    Crop Factor 0.79x 1.0x
    Sensor Resolution 39.5 Megapixels 42.2 Megapixels
    Image Resolution 7264 x 5440 pixels 7952 x 5304 pixels
    Pixel Pitch 6.06 μm 4.52 μm
    Pixel Density 2.72 MP/cm2 4.90 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability no Video 4K/30p Video
    ISO Setting 100-1600 ISO 100-25600 ISO
    ISO Boost no Enhancement 50-25600 ISO
    Image Processor PRIME II BIONZ X
    DXO Sensor Quality (score) 82 92
    DXO Color Depth (bits) 24.6 25.4
    DXO Dynamic Range (EV) 12.6 13.4
    DXO Low Light (ISO) 1262 2317
    Screen Specs Pentax 645D Sony A99 II
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 98% 100%
    Viewfinder Magnification 0.78x 0.78x
    Viewfinder Resolution 2400k dots
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View
    Rear LCD Size 3.0 inch 3.0 inch
    LCD Resolution 921k dots 1229k dots
    LCD Attachment Fixed screen Fully flexible screen
    Shooting Specs Pentax 645D Sony A99 II
    Autofocus System Phase-detect AF Phase-detect AF
    Manual Focusing AidNo Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000/s 1/8000/s
    Continuous Shooting 1.1 shutter flaps/s 12 shutter flaps/s
    Shutter Life Expectancy50 000 actuations300 000 actuations
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards MS or SDXC cards
    Second Storage Option Dual card slots Dual card slots
    UHS card support no UHS-I
    Connectivity Specs Pentax 645D Sony A99 II
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    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
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Pentax 645D Sony A99 II
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type D-LI90 power pack NP-FM500H power pack
    Battery Life (CIPA)800 shots per charge490 shots per charge
    Body Dimensions 156 x 117 x 119 mm
    (6.1 x 4.6 x 4.7 in)
    143 x 104 x 76 mm
    (5.6 x 4.1 x 3.0 in)
    Camera Weight 1480 g (52.2 oz) 849 g (29.9 oz)

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