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Fujifilm X-M1 versus Pentax 645D

The Fujifilm X-M1 and the Pentax 645D are two digital cameras that were officially introduced, respectively, in June 2013 and March 2010. The X-M1 is a mirrorless interchangeable lens camera, while the 645D is a DSLR. The cameras are based on an APS-C (X-M1) and a medium format (645D) sensor. The Fujifilm has a resolution of 16 megapixel, whereas the Pentax provides 39.5 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: Fujifilm X-M1 vs Pentax 645D

An illustration of the physical size and weight of the Fujifilm X-M1 and the Pentax 645D 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 measures are rounded to the nearest millimeter. You can also use the toggle button to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left side – the X-M1 – represents the basis for the calculations across all the size and weight measures).

Compare Fujifilm X-M1 vs Pentax 645D
Compare X-M1 versus 645D top
Compare X-M1 and 645D rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645D is considerably larger (133 percent) than the Fujifilm X-M1. Moreover, the 645D is substantially heavier (348 percent) than the X-M1. It is noteworthy in this context that the 645D is splash and dust-proof, while the X-M1 does not feature any corresponding weather-sealing.

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 X-M1 gets 350 shots out of its NP-W126 battery, while the 645D can take 800 images on a single charge of its D-LI90 power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. In case you want to display and compare another camera duo, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.

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
Fujifilm X-M1» 4.6 in 2.6 in 1.5 in 11.6 oz 350 n Jun 2013 699- i Fujifilm X-M1
Pentax 645D« 6.1 in 4.6 in 4.7 in 52.2 oz 800 Y Mar 2010 9,995- i Pentax 645D
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
Fujifilm X-A10« » 4.6 in 2.6 in 1.6 in 11.7 oz 410 n Dec 2016 399 i i Fujifilm X-A10
Fujifilm X-E2S« » 5.1 in 3.0 in 1.5 in 12.3 oz 350 n Jan 2016 699- i Fujifilm X-E2S
Fujifilm X-A2« » 4.6 in 2.6 in 1.6 in 12.3 oz 410 n Jan 2015 399- i Fujifilm X-A2
Fujifilm X-T10« » 4.6 in 3.3 in 1.6 in 13.4 oz 350 n May 2015 799- i Fujifilm X-T10
Fujifilm X-A1« » 4.6 in 2.6 in 1.5 in 11.6 oz 350 n Sep 2013 399- i Fujifilm X-A1
Fujifilm X-E2« » 5.1 in 3.0 in 1.5 in 12.3 oz 350 n Oct 2013 999- i Fujifilm X-E2
Fujifilm X-E1« » 5.1 in 3.0 in 1.5 in 12.3 oz 350 n Sep 2012 999- i Fujifilm X-E1
Fujifilm X-Pro1« » 5.5 in 3.2 in 1.7 in 15.9 oz 300 n Jan 2012 1,699- i Fujifilm X-Pro1
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 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 NEX-5R« » 4.4 in 2.3 in 1.5 in 9.7 oz 330 n Aug 2012 749- i Sony NEX-5R
Sony NEX-F3« » 4.6 in 2.6 in 1.7 in 11.1 oz 470 n May 2012 599- i Sony NEX-F3

The price is, of course, an important factor in any camera decision. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The X-M1 was launched at a markedly lower price (by 93 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: Fujifilm X-M1 vs Pentax 645D

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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Fujifilm X-M1 features an APS-C sensor and the Pentax 645D a medium format sensor. The sensor area in the 645D is 295 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 0.79. The sensor in the X-M1 has a native 3:2 aspect ratio, while the one in the 645D offers a 4:3 aspect.

Fujifilm X-M1 and Pentax 645D sensor measures

With 39.5MP, the 645D offers a higher resolution than the X-M1 (16MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.80μm for the X-M1) due to its larger sensor. However, the X-M1 is a much more recent model (by 3 years and 3 months) than the 645D, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. 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.

X-M1 versus 645D MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. 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
Fujifilm X-M1» APS-C 16.0 4896 32641080/30p----Fujifilm X-M1
Pentax 645D« Medium Format 39.5 7264 5440-24.612.6126282Pentax 645D
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
Fujifilm X-A10« » APS-C 16.0 4896 32641080/30p----Fujifilm X-A10
Fujifilm X-E2S« » APS-C 16.0 4896 32641080/60p----Fujifilm X-E2S
Fujifilm X-A2« » APS-C 16.0 4896 32641080/30p----Fujifilm X-A2
Fujifilm X-T10« » APS-C 16.0 4896 32641080/60p----Fujifilm X-T10
Fujifilm X-A1« » APS-C 16.0 4896 32641080/30p----Fujifilm X-A1
Fujifilm X-E2« » APS-C 16.0 4896 32641080/60p----Fujifilm X-E2
Fujifilm X-E1« » APS-C 16.0 4896 32641080/24p----Fujifilm X-E1
Fujifilm X-Pro1« » APS-C 16.0 4896 32641080/24p----Fujifilm X-Pro1
Leica S Typ 006« » Medium Format 37.5 7500 5000-23.912.282476Leica S Typ 006
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 NEX-5R« » APS-C 16.0 4912 32641080/60i23.713.191078Sony NEX-5R
Sony NEX-F3« » APS-C 16.0 4912 32641080/60i22.712.3111473Sony NEX-F3

Many modern cameras cannot only take still pictures, but also record videos. The X-M1 indeed provides movie recording capabilities, while the 645D does not. The highest resolution format that the X-M1 can use is 1080/30p.

 

Feature comparison: Fujifilm X-M1 vs Pentax 645D

Beyond body and sensor, cameras can and do differ across a range of features. For example, the 645D has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the X-M1 relies on live view and the rear LCD for framing. The following table reports on some other key feature differences and similarities of the Fujifilm X-M1, the Pentax 645D, and comparable cameras. The full specs-sheets can be found in the camera manual or in the dpreview camera hub.

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
Fujifilm X-M1»- n 3.0 920 tilting n 4000 5.6 Y n Fujifilm X-M1
Pentax 645D«optical Y 3.0 921 fixed n 4000 1.1 n n Pentax 645D
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
Fujifilm X-A10« »- n 3.0 1040 tilting n 4000 6.0 Y n Fujifilm X-A10
Fujifilm X-E2S« »2360 n 3.0 1040 fixed n 4000 7.0 Y n Fujifilm X-E2S
Fujifilm X-A2« »- n 3.0 920 tilting n 4000 5.6 Y n Fujifilm X-A2
Fujifilm X-T10« »2360 n 3.0 920 tilting n 4000 8.0 Y n Fujifilm X-T10
Fujifilm X-A1« »- n 3.0 920 tilting n 4000 5.6 Y n Fujifilm X-A1
Fujifilm X-E2« »2360 n 3.0 1040 fixed n 4000 7.0 Y n Fujifilm X-E2
Fujifilm X-E1« »2360 n 2.8 460 fixed n 4000 6.0 Y n Fujifilm X-E1
Fujifilm X-Pro1« »1440 n 3.0 1230 fixed n 4000 6.0 n n Fujifilm X-Pro1
Leica S Typ 006« »optical Y 3.0 922 fixed n 4000 1.5 n n Leica S Typ 006
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 NEX-5R« »- n 3.0 920 tilting Y 4000 10.0 n n Sony NEX-5R
Sony NEX-F3« »- n 3.0 920 tilting n 4000 5.5 Y n Sony NEX-F3

One difference between the cameras concerns the presence of an on-board flash. The X-M1 has one, while the 645D does not. While the build-in flash of the X-M1 is not very powerful, it can at times be useful as a fill-in light.

Both the X-M1 and the 645D write their imaging data to SDXC cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the X-M1 only has one slot.

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
Fujifilm X-M1»Ystereomono--mini2.0Y--Fujifilm X-M1
Pentax 645D«Ystereo----2.0---Pentax 645D
Canon 1D X« »Ymono-Y-mini2.0---Canon 1D X
Canon 1D Mark IV« »Ystereo-Y-mini2.0---Canon 1D Mark IV
Fujifilm X-A10« »-stereomono--mini2.0Y--Fujifilm X-A10
Fujifilm X-E2S« »YstereomonoY-micro2.0Y--Fujifilm X-E2S
Fujifilm X-A2« »Ystereomono--mini2.0Y--Fujifilm X-A2
Fujifilm X-T10« »Ystereomono--micro2.0Y--Fujifilm X-T10
Fujifilm X-A1« »Ystereomono--mini2.0Y--Fujifilm X-A1
Fujifilm X-E2« »YstereomonoY-micro2.0Y--Fujifilm X-E2
Fujifilm X-E1« »YstereomonoY-mini2.0---Fujifilm X-E1
Fujifilm X-Pro1« »Ystereomono--mini2.0---Fujifilm X-Pro1
Leica S Typ 006« »Y----mini2.0---Leica S Typ 006
Nikon D3S« »Ystereo---mini2.0---Nikon D3S
Pentax 645Z« »YstereomonoY-mini3.0---Pentax 645Z
Sony NEX-5R« »Ystereomono--mini2.0Y--Sony NEX-5R
Sony NEX-F3« »Ystereomono--mini2.0---Sony NEX-F3

Both the X-M1 and the 645D have been discontinued, but can regularly be found used on eBay. The 645D was replaced by the Pentax 645Z, while the X-M1 does not have a direct successor.

Review summary: Fujifilm X-M1 vs Pentax 645D

So what conclusions can be drawn? Which of the two cameras – the Fujifilm X-M1 or the Pentax 645D – has the upper hand? A synthesis of the relative strong points of each of the models is listed below.

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Arguments in favor of the Fujifilm X-M1:

  • Broader imaging potential: Can record not only still images but also 1080/30p movies.
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Faster burst: Shoots at higher frequency (5.6 vs 1.1 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (117x67mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 1150g or 78 percent) and hence easier to carry around.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • 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 (93 percent cheaper at launch).
  • More modern: Reflects 3 years and 3 months of technical progress since the 645D launch.

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Reasons to prefer the Pentax 645D:

  • More detail: Has more megapixels (39.5 vs 16MP), which boosts linear resolution by 54%.
  • Easier framing: Has an optical viewfinder for image framing and settings control.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Longer lasting: Gets more shots (800 versus 350) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been around for much longer (launched in March 2010).

If the number of relative strengths (bullet points above) is taken as a guide, the X-M1 emerges as the winner of the contest (10 : 7 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.

X-M1 10:07 645D

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains incomplete and does no justice, for example, to the way the X-M1 or the 645D handle or perform in practice. 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. This is why expert reviews are important. The table below summarizes the assessments of some of the best known camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The detailed reviews can be accessed 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
Fujifilm X-M1»Rec77/1004.5/5-4.5/5 Jun 2013 699- i Fujifilm X-M1
Pentax 645D«---4.5/5- Mar 2010 9,995- i Pentax 645D
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
Fujifilm X-A10« »--4/5-4/5 Dec 2016 399 i i Fujifilm X-A10
Fujifilm X-E2S« »-77/1004.5/5-4.5/5 Jan 2016 699- i Fujifilm X-E2S
Fujifilm X-A2« »--4.5/54/54.5/5 Jan 2015 399- i Fujifilm X-A2
Fujifilm X-T10« »HiRec80/1005/54/55/5 May 2015 799- i Fujifilm X-T10
Fujifilm X-A1« »--4.5/5-4.5/5 Sep 2013 399- i Fujifilm X-A1
Fujifilm X-E2« »-80/1004.5/5-5/5 Oct 2013 999- i Fujifilm X-E2
Fujifilm X-E1« »HiRec79/1004.5/54.5/54.5/5 Sep 2012 999- i Fujifilm X-E1
Fujifilm X-Pro1« »HiRec79/1004.5/54/54.5/5 Jan 2012 1,699- i Fujifilm X-Pro1
Leica S Typ 006« »----- Sep 2012 21,950- i Leica S Typ 006
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 NEX-5R« »--4.5/5-4.5/5 Aug 2012 749- i Sony NEX-5R
Sony NEX-F3« »-74/1004.5/54.5/54.5/5 May 2012 599- i Sony NEX-F3

The review scores listed above should be treated 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. Also, please note that some of the review sites have changed their methodology and reporting over time.

 

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 use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored. If the camera you are interested in is not available, please send me an email, and I will try to update the database with the necessary infos.

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