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Pentax 645D versus Nikon D750

The Pentax 645D and the Nikon D750 are two digital cameras that were officially introduced, respectively, in March 2010 and September 2014. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a medium format (645D) and a full frame (D750) sensor. The Pentax has a resolution of 39.5 megapixel, whereas the Nikon provides 24.2 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.

Body comparison: Pentax 645D vs Nikon D750

The physical size and weight of the Pentax 645D and the Nikon D750 are illustrated 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 size dimensions are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left – the 645D – represents the basis or 100 percent across all the size and weight measures).

Compare Pentax 645D vs Nikon D750
Compare 645D versus D750 top
Compare 645D and D750 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Nikon D750 is notably smaller (13 percent) than the Pentax 645D. Moreover, the D750 is substantially lighter (49 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 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 D750 can take 1230 images on a single charge of its EN-EL15 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons 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
Nikon D750« 5.6 in 4.4 in 3.1 in 26.5 oz 1230 Y Sep 2014 2,299 i i Nikon D750
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 SL« » 5.8 in 4.1 in 1.5 in 29.9 oz 400 Y Oct 2015 7,450 i i Leica SL
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 Df« » 5.7 in 4.3 in 2.6 in 26.8 oz 1400 Y Nov 2013 2,749 i i Nikon Df
Nikon D610« » 5.6 in 4.4 in 3.2 in 30.0 oz 900 Y Oct 2013 1,999 i i Nikon D610
Nikon D600« » 5.6 in 4.4 in 3.2 in 30.0 oz 900 Y Sep 2012 2,099- i Nikon D600
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« » 5.0 in 3.7 in 1.9 in 16.4 oz 340 Y Oct 2013 2,299- i Sony A7R

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 D750 was launched at a markedly lower price (by 77 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.

 

Sensor comparison: Pentax 645D vs Nikon D750

The size of the imaging sensor is a crucial determinant 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 645D features a medium format sensor and the Nikon D750 a full frame sensor. The sensor area in the D750 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 D750 offers a 3:2 aspect.

Pentax 645D and Nikon D750 sensor measures

With 39.5MP, the 645D offers a higher resolution than the D750 (24.2MP), but the 645D nevertheless has marginally larger individual pixels (pixel pitch of 6.06μm versus 5.97μm for the D750) due to its larger sensor. However, the D750 is a somewhat more recent model (by 4 years and 6 months) than the 645D, and its sensor might 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.

645D versus D750 MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). Of the two cameras under consideration, the D750 offers substantially better image quality than the 645D (overall score 11 points higher). The advantage is based on 0.2 bits higher color depth, 1.9 EV in additional dynamic range, and 1.2 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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
Nikon D750« Full Frame 24.2 6016 40161080/60p24.814.5295693Nikon D750
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 SL« » Full Frame 24.0 6000 40004K/30p25.013.4182188Leica SL
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 Df« » Full Frame 16.2 4928 3280-24.613.1327989Nikon Df
Nikon D610« » Full Frame 24.2 6016 40161080/30p25.114.4292594Nikon D610
Nikon D600« » Full Frame 24.2 6016 40161080/30p25.114.2298094Nikon D600
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« » Full Frame 36.2 7360 49121080/60p25.614.1274695Sony A7R

Many modern cameras are not only capable of taking still images, but also of capturing video footage. The D750 indeed provides for movie recording, while the 645D does not. The highest resolution format that the D750 can use is 1080/60p.

 

Feature comparison: Pentax 645D vs Nikon D750

Apart from body and sensor, cameras can and do differ across a variety of features. The 645D and the D750 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The table below summarizes some of the other core capabilities of the Pentax 645D and Nikon D750 in connection with corresponding information for a sample of similar cameras. If needed, the dpreview camera hub, for example, contains further detail on the cameras' specs.

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)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec)
Build-in
Flash
(yes/no)
Build-in
Image
Stab
Camera
Model
Pentax 645D»optical Y 3.0 921 fixed n 4000 1.1 n n Pentax 645D
Nikon D750«optical Y 3.2 1229 tilting n 4000 6.0 Y n Nikon D750
Canon 1D X Mark II« »optical Y 3.2 1620 fixed Y 8000 16.0 n n Canon 1D X Mark II
Canon 1D X« »optical Y 3.2 1040 fixed n 8000 14.0 n n Canon 1D X
Canon 1D Mark IV« »optical Y 3.0 920 fixed n 8000 10.0 n n Canon 1D Mark IV
Leica SL« »4400 Y 3.0 1040 fixed Y 8000 11.0 n n Leica SL
Leica S Typ 006« »optical Y 3.0 922 fixed n 4000 1.5 n n Leica S Typ 006
Nikon D850« »optical Y 3.2 2359 tilting Y 8000 9.0 n n Nikon D850
Nikon D5« »optical Y 3.2 2359 fixed Y 8000 14.0 n n Nikon D5
Nikon D810« »optical Y 3.2 1229 fixed n 8000 5.0 Y n Nikon D810
Nikon Df« »optical Y 3.2 921 fixed n 4000 5.5 n n Nikon Df
Nikon D610« »optical Y 3.2 921 fixed n 4000 6.0 Y n Nikon D610
Nikon D600« »optical Y 3.0 921 fixed n 4000 5.5 Y n Nikon D600
Nikon D3S« »optical Y 3.0 921 fixed n 8000 11.0 n n Nikon D3S
Pentax 645Z« »optical Y 3.2 1037 tilting n 4000 3.0 n n Pentax 645Z
Sony A7R« »2400 n 3.0 1230 tilting n 8000 4.0 n n Sony A7R

One difference between the cameras concerns the presence of an on-board flash. The D750 has one, while the 645D does not. While the build-in flash of the D750 is not very powerful, it can at times be useful as a fill-in light.

Both the 645D and the D750 write their imaging data to SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails.

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
Nikon D750«YstereomonoYYmini2.0Y--Nikon D750
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 SL« »YstereomonoYYfull3.0Y--Leica SL
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 Df« »Y----mini2.0---Nikon Df
Nikon D610« »YmonomonoYYmini2.0---Nikon D610
Nikon D600« »YmonomonoYYmini2.0---Nikon D600
Nikon D3S« »Ystereo---mini2.0---Nikon D3S
Pentax 645Z« »YstereomonoY-mini3.0---Pentax 645Z
Sony A7R« »YstereomonoYYmicro2.0YY-Sony A7R

The D750 is a recent model that features in the current product line-up of Nikon. 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.

Review summary: Pentax 645D vs Nikon D750

So how do things add up? Is the Pentax 645D better than the Nikon D750 or vice versa? A synthesis of the relative strong points of each of the models is listed below.

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Reasons to prefer the Pentax 645D:

  • More detail: Offers more megapixels (39.5 vs 24.2MP) with a 25% higher linear resolution.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • More heavily discounted: Has been available for much longer (launched in March 2010).

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Arguments in favor of the Nikon D750:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better image quality: Scores substantially higher (11 points) in the DXO overall evaluation.
  • More dynamic range: Captures a broader range of light and dark details (1.9 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.2 stops ISO advantage).
  • Broader imaging potential: Can capture not only stills but also 1080/60p video.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 921k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Faster burst: Shoots at higher frequency (6 vs 1.1 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (141x113mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 730g or 49 percent) and is thus easier to take along.
  • Longer lasting: Gets more shots (1230 versus 800) out of a single battery charge.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • Easier file upload: Has wifi build in for automatic backup or image transfer to the web.
  • More affordable: Was introduced into a lower priced category (77 percent cheaper at launch).
  • More modern: Reflects 4 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 D750 is the clear winner of the contest (16 : 3 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.

645D 03:16 D750

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 handling experience and imaging performance when actually working with the 645D or the D750. 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 expert reviews are important. The following table reports the overall rankings of the cameras as published by some of the major camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). You can find the full text of the reviews by clicking on the site logo in the table header.

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
Nikon D750«HiRec90/1004.5/55/54.5/5 Sep 2014 2,299 i i Nikon D750
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 SL« »-84/1004.5/54/54/5 Oct 2015 7,450 i i Leica SL
Leica S Typ 006« »----- Sep 2012 21,950- i Leica S Typ 006
Nikon D850« »HiRec89/1004.5/55/55/5 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 Df« »-81/1004/54/54/5 Nov 2013 2,749 i i Nikon Df
Nikon D610« »HiRec87/1004.5/54.5/54.5/5 Oct 2013 1,999 i i Nikon D610
Nikon D600« »HiRec87/1005/54.5/54.5/5 Sep 2012 2,099- i Nikon D600
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« »HiRec82/1004.5/55/55/5 Oct 2013 2,299- i Sony A7R

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. 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. 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? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. An an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool. If the camera you are interested in is not available, kindly get in touch, and I will try to locate and add the respective data to the application.

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