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Fujifilm GFX 100S vs Pentax 645D

The Fujifilm GFX 100S and the Pentax 645D are two professional cameras that were officially introduced, respectively, in January 2021 and March 2010. The GFX 100S is a mirrorless interchangeable lens camera, while the 645D is a DSLR. Both cameras are equipped with a medium format sensor. The Fujifilm has a resolution of 101.8 megapixels, whereas the Pentax provides 39.5 MP.

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

Headline Specifications
Fujifilm GFX 100S versus Pentax 645D
Fujifilm GFX 100S Pentax 645D
Mirrorless system camera Digital single lens reflex
Fujifilm G mount lenses Pentax 645 mount lenses
101.8 MP, Medium Format Sensor 39.5 MP, Medium Format Sensor
4K/30p Video no Video
ISO 100-12,800 (50 - 102,400) ISO 100-1,600
Electronic viewfinder (3690k dots) Optical viewfinder
3.2 LCD, 2360k dots 3.0 LCD, 921k dots
Fully flexible touchscreen Fixed screen (not touch-sensitive)
5 shutter flaps per second 1.1 shutter flaps per second
In-body stabilizationLens stabilization only
Weathersealed bodyWeathersealed body
460 shots per battery charge800 shots per battery charge
150 x 104 x 87 mm, 900 g 156 x 117 x 119 mm, 1480 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm GFX 100S and the Pentax 645D? 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

An illustration of the physical size and weight of the Fujifilm GFX 100S and the Pentax 645D is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

Size Fujifilm GFX 100S vs Pentax 645D
Compare GFX 100S versus 645D top
Comparison GFX 100S or 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 notably larger (17 percent) than the Fujifilm GFX 100S. Moreover, the 645D is substantially heavier (64 percent) than the GFX 100S. 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 GFX 100S gets 460 shots out of its NP-W235 battery, while the 645D can take 800 images on a single charge of its D-LI90 power pack. The power pack in the GFX 100S can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

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, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Fujifilm GFX 100S 150 mm 104 mm 87 mm 900 g 460 Y Jan 2021 5,999 i
2.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995 i
3.
 
Canon R5 138 mm 98 mm 88 mm 738 g 320 Y Jul 2020 3,899 i
4.
 
Canon 1D X 158 mm 168 mm 83 mm 1551 g 1120 Y Oct 2011 6,799 i
5.
 
Canon 1D Mark IV 156 mm 157 mm 80 mm 1230 g 1500 Y Oct 2009 4,999 i
6.
 
Fujifilm X-T4 135 mm 93 mm 64 mm 607 g 500 Y Feb 2020 1,699 i
7.
 
Fujifilm GFX 100 156 mm 144 mm 75 mm 1320 g 800 Y May 2019 9,999 i
8.
 
Fujifilm GFX 50R 161 mm 97 mm 66 mm 775 g 400 Y Sep 2018 4,499 i
9.
 
Fujifilm XP130 110 mm 71 mm 28 mm 207 g 240 n Jan 2018 229 i
10.
 
Fujifilm GFX 50S 148 mm 94 mm 91 mm 740 g 400 Y Sep 2016 6,499 i
11.
 
Leica SL2-S 146 mm 107 mm 83 mm 931 g 510 Y Dec 2020 4,895 i
12.
 
Leica SL2 146 mm 107 mm 42 mm 953 g 370 Y Nov 2019 5,999 i
13.
 
Leica S Typ 006 160 mm 120 mm 80 mm 1260 g .. Y Sep 2012 21,950 i
14.
 
Nikon D3S 160 mm 157 mm 88 mm 1240 g 4200 Y Oct 2009 5,199 i
15.
 
Pentax K-3 III 135 mm 104 mm 74 mm 820 g 800 Y Mar 2021 1,999 i
16.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499 i
17.
 
Sony A1 129 mm 97 mm 81 mm 737 g 530 Y Jan 2021 6,499 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

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 GFX 100S was launched at a markedly lower price (by 40 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.

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Sensor comparison

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 generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have 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 more expensive and lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature a medium format sensor, but their sensors differ slightly in size. The sensor area in the 645D is 1 percent bigger. They nevertheless have the same format factor of 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Fujifilm GFX 100S and Pentax 645D sensor measures

Despite having a slightly smaller sensor, the Fujifilm GFX 100S offers a higher resolution of 101.8 megapixels, compared with 39.5 MP of the Pentax 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 3.76μm versus 6.06μm for the 645D). However, it should be noted that the GFX 100S is much more recent (by 10 years and 10 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 Fujifilm GFX 100S implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the GFX 100S for good quality output (200 dots per inch) amounts to 58.2 x 43.7 inches or 147.9 x 110.9 cm, for very good quality (250 dpi) 46.6 x 34.9 inches or 118.3 x 88.8 cm, and for excellent quality (300 dpi) 38.8 x 29.1 inches or 98.6 x 74 cm. The corresponding values for the Pentax 645D are 36.3 x 27.2 inches or 92.3 x 69.1 cm for good quality, 29.1 x 21.8 inches or 73.8 x 55.3 cm for very good quality, and 24.2 x 18.1 inches or 61.5 x 46.1 cm for excellent quality prints.

The GFX 100S has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the 645D, the GFX 100S has the capacity to capture high quality composite images (YESMP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Fujifilm GFX 100S has a native sensitivity range from ISO 100 to ISO 12800, which can be extended to ISO 50-102400. The corresponding ISO settings for the Pentax 645D are ISO 100 to ISO 1600 (no boost).

GFX 100S versus 645D MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar 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
1.
 
Fujifilm GFX 100S Medium Format 101.8 11648 87364K/30p...... ..
2.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.61262 82
3.
 
Canon R5 Full Frame 44.8 8192 54648k/30p25.314.63042 95
4.
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.82786 82
5.
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.01320 74
6.
 
Fujifilm X-T4 APS-C 26.0 6240 41604K/60p...... ..
7.
 
Fujifilm GFX 100 Medium Format 101.8 11648 87364K/30p...... ..
8.
 
Fujifilm GFX 50R Medium Format 51.1 8256 61921080/30p...... ..
9.
 
Fujifilm XP130 1/2.3 15.9 4608 34561080/60p...... ..
10.
 
Fujifilm GFX 50S Medium Format 51.1 8256 61921080/30p...... ..
11.
 
Leica SL2-S Full Frame 24.0 6000 40004K/60p25.214.13504 95
12.
 
Leica SL2 Full Frame 46.7 8368 55844K/60p...... ..
13.
 
Leica S Typ 006 Medium Format 37.5 7500 5000none23.912.2824 76
14.
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.03253 82
15.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p...... ..
16.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505 101
17.
 
Sony A1 Full Frame 49.8 8640 57608k/30p...... ..

Many modern cameras are not only capable of taking still images, but also of capturing video footage. The GFX 100S indeed provides movie recording capabilities, while the 645D does not. The highest resolution format that the GFX 100S can use is 4K/30p.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the GFX 100S has an electronic viewfinder (3690k 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 GFX 100S 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 0.77x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Fujifilm GFX 100S and Pentax 645D along with similar information for a selection of comparators.

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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
1.
 
Fujifilm GFX 100S3690 Y 3.2 2360 full-flex Y 1/4000s 5.0 n Y
2.
 
Pentax 645Doptical Y 3.0 921 fixed n 1/4000s 1.1 n n
3.
 
Canon R55760 Y 3.2 2100 swivel Y 1/8000s 10.0 n Y
4.
 
Canon 1D Xoptical Y 3.2 1040 fixed n 1/8000s 14.0 n n
5.
 
Canon 1D Mark IVoptical Y 3.0 920 fixed n 1/8000s 10.0 n n
6.
 
Fujifilm X-T43690 n 3.0 1620 swivel Y 1/8000s 15.0 n Y
7.
 
Fujifilm GFX 100optional Y 3.2 2360 tilting Y 1/4000s 5.0 n Y
8.
 
Fujifilm GFX 50R3690 n 3.2 2360 tilting Y 1/4000s 3.0 n n
9.
 
Fujifilm XP130none n 3.0 920 fixed n 1/2000s 10.0 Y Y
10.
 
Fujifilm GFX 50Soptional Y 3.2 2360 full-flex Y 1/4000s 3.0 n n
11.
 
Leica SL2-S5760 Y 3.2 2100 fixed Y 1/8000s 20.0 n Y
12.
 
Leica SL25760 Y 3.2 2100 fixed Y 1/8000s 10.0 n Y
13.
 
Leica S Typ 006optical Y 3.0 922 fixed n 1/4000s 1.5 n n
14.
 
Nikon D3Soptical Y 3.0 921 fixed n 1/8000s 11.0 n n
15.
 
Pentax K-3 IIIoptical Y 3.2 1620 fixed Y 1/8000s 12.0 n Y
16.
 
Pentax 645Zoptical Y 3.2 1037 tilting n 1/4000s 3.0 n n
17.
 
Sony A19437 n 3.0 1440 tilting Y 1/8000s 10.0 n Y

One feature that differentiates the GFX 100S and the 645D is in-body image stabilization (IBIS). The GFX 100S reduces the risk of handshake-induced blur with all attached lenses, while the 645D offers no blur reduction with lenses that themselves do not provide optical image stabilization.

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 GFX 100S 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 Fujifilm GFX 100S and the Pentax 645D both have 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.

Concerning the storage of imaging data, both the GFX 100S and the 645D write their files to SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. The GFX 100S supports UHS-II cards (on both slots), while the 645D cannot take advantage of Ultra High Speed SD cards.

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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 Fujifilm GFX 100S and Pentax 645D 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
1.
 
Fujifilm GFX 100SYstereomonoYYmicro3.2Y-Y
2.
 
Pentax 645DYstereo----2.0---
3.
 
Canon R5YmonomonoYYmicro3.2Y-Y
4.
 
Canon 1D XYmono-Y-mini2.0---
5.
 
Canon 1D Mark IVYstereo-Y-mini2.0---
6.
 
Fujifilm X-T4YstereomonoY-micro3.1Y-Y
7.
 
Fujifilm GFX 100YstereomonoYYmicro3.1Y-Y
8.
 
Fujifilm GFX 50RYstereomonoYYmicro3.0Y-Y
9.
 
Fujifilm XP130-monomono--micro2.0Y-Y
10.
 
Fujifilm GFX 50SYstereomonoYYmicro3.0Y--
11.
 
Leica SL2-SYstereomonoYYfull3.2Y-Y
12.
 
Leica SL2YstereomonoYYfull3.1Y-Y
13.
 
Leica S Typ 006Y----mini2.0---
14.
 
Nikon D3SYstereo---mini2.0---
15.
 
Pentax K-3 IIIYstereomonoYYmicro3.2Y-Y
16.
 
Pentax 645ZYstereomonoY-mini3.0---
17.
 
Sony A1YstereomonoYYmini3.2Y-Y

It is notable that the GFX 100S offers wifi support, while the 645D does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

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

The GFX 100S is a recent model that features in the current product line-up of Fujifilm. 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 Fujifilm and Pentax websites.

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Review summary

So what is the bottom line? Is the Fujifilm GFX 100S better than the Pentax 645D or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Fujifilm GFX 100S:

  • More detail: Offers more megapixels (101.8 vs 39.5MP) with a 60% higher linear resolution.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Broader imaging potential: Can record not only still images but also 4K/30p movies.
  • 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%).
  • 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 (2360k vs 921k dots).
  • More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster burst: Shoots at higher frequency (5 vs 1.1 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (150x104mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 580g or 39 percent) and hence easier to carry around.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Sharper images: Has hand-shake reducing image stabilization built-in.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Faster data transfer: Supports a more advanced USB protocol (3.2 vs 2.0).
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Faster buffer clearing: Supports Ultra High Speed (UHS-II) SDXC cards on both slots.
  • More affordable: Was introduced into a lower priced category (40 percent cheaper at launch).
  • More modern: Reflects 10 years and 10 months of technical progress since the 645D launch.

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Arguments in favor of the Pentax 645D:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.77x).
  • Longer lasting: Gets more shots (800 versus 460) out of a single battery charge.
  • More heavily discounted: Has been around for much longer (launched in March 2010).

If the count of individual advantages (bullet points above) is taken as a guide, the GFX 100S is the clear winner of the match-up (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.

GFX 100S 23:04 645D

How about other alternatives? Do the specifications of the Fujifilm GFX 100S and the Pentax 645D place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR 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 GFX 100S and the 645D in practical situations. 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.

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 (amateurphotographer [AP], cameralabs [CL], 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.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Fujifilm GFX 100S5/5..90/100..5/5 Jan 2021 5,999 i
2.
 
Pentax 645D5/5........ Mar 2010 9,995 i
3.
 
Canon R54.5/5..91/1004.5/54.5/5 Jul 2020 3,899 i
4.
 
Canon 1D X5/5....4.5/54.5/5 Oct 2011 6,799 i
5.
 
Canon 1D Mark IV5/5..89/100.... Oct 2009 4,999 i
6.
 
Fujifilm X-T45/5+ +..5/55/5 Feb 2020 1,699 i
7.
 
Fujifilm GFX 1004.5/5+ +90/1005/54.5/5 May 2019 9,999 i
8.
 
Fujifilm GFX 50R5/5..84/1004.5/54.5/5 Sep 2018 4,499 i
9.
 
Fujifilm XP130..o..3.5/54/5 Jan 2018 229 i
10.
 
Fujifilm GFX 50S....85/1005/54.5/5 Sep 2016 6,499 i
11.
 
Leica SL2-S4/5....4.5/54.5/5 Dec 2020 4,895 i
12.
 
Leica SL24/5....4.5/54/5 Nov 2019 5,999 i
13.
 
Leica S Typ 006.......... Sep 2012 21,950 i
14.
 
Nikon D3S5/5..89/1004.5/55/5 Oct 2009 5,199 i
15.
 
Pentax K-3 III.......... Mar 2021 1,999 i
16.
 
Pentax 645Z5/5....4.5/55/5 Apr 2014 8,499 i
17.
 
Sony A15/5o93/1004.5/55/5 Jan 2021 6,499 i
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 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.

Fujifilm GFX 100S:
Check Amazon price
Pentax 645D:
Check Ebay offers

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.

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    Specifications: Fujifilm GFX 100S vs Pentax 645D

    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 Fujifilm GFX 100S Pentax 645D
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Fujifilm G mount lenses Pentax 645 mount lenses
    Launch Date January 2021 March 2010
    Launch Price USD 5,999 USD 9,995
    Sensor Specs Fujifilm GFX 100S Pentax 645D
    Sensor Technology BSI-CMOS CCD
    Sensor Format Medium Format Sensor Medium Format Sensor
    Sensor Size 43.8 x 32.9 mm 44.0 x 33.0 mm
    Sensor Area 1441.02 mm2 1452 mm2
    Sensor Diagonal 54.8 mm 55 mm
    Crop Factor 0.79x 0.79x
    Sensor Resolution 101.8 Megapixels 39.5 Megapixels
    Image Resolution 11648 x 8736 pixels 7264 x 5440 pixels
    Pixel Pitch 3.76 μm 6.06 μm
    Pixel Density 7.06 MP/cm2 2.72 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video no Video
    ISO Setting 100 - 12,800 ISO 100 - 1,600 ISO
    ISO Boost 50 - 102,400 ISO no Enhancement
    Image Processor X-Processor 4 PRIME II
    DXO Sensor Quality (score) .. 82
    DXO Color Depth (bits) .. 24.6
    DXO Dynamic Range (EV) .. 12.6
    DXO Low Light (ISO) .. 1262
    Screen Specs Fujifilm GFX 100S Pentax 645D
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 98%
    Viewfinder Magnification 0.77x 0.78x
    Viewfinder Resolution 3690k dots
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View
    Rear LCD Size 3.2inch 3.0inch
    LCD Resolution 2360k dots 921k dots
    LCD Attachment Fully flexible screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Fujifilm GFX 100S Pentax 645D
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus Peakingno Peaking Feature
    Continuous Shooting 5 shutter flaps/s 1.1 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationIn-body stabilizationLens stabilization only
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Second Storage Option Dual card slots Dual card slots
    UHS card support Dual UHS-II no
    Connectivity Specs Fujifilm GFX 100S Pentax 645D
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 3.2 USB 2.0
    HDMI Port micro HDMI no HDMI
    Microphone Port External MIC port no MIC socket
    Headphone Socket Headphone port no Headphone port
    Wifi Support Wifi built-in no Wifi
    Bluetooth Support Bluetooth built-in no Bluetooth
    Body Specs Fujifilm GFX 100S Pentax 645D
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type NP-W235 D-LI90
    Battery Life (CIPA)460 shots per charge800 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 150 x 104 x 87 mm
    (5.9 x 4.1 x 3.4 in)
    156 x 117 x 119 mm
    (6.1 x 4.6 x 4.7 in)
    Camera Weight 900 g (31.7 oz) 1480 g (52.2 oz)

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