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Fujifilm GFX 100 vs Pentax K-S1

The Fujifilm GFX 100 and the Pentax K-S1 are two digital cameras that were revealed to the public, respectively, in May 2019 and August 2014. The GFX 100 is a mirrorless interchangeable lens camera, while the K-S1 is a DSLR. The cameras are based on a medium format (GFX 100) and an APS-C (K-S1) sensor. The Fujifilm has a resolution of 101.8 megapixels, whereas the Pentax provides 20 MP.

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

Headline Specifications
Fujifilm GFX 100 versus Pentax K-S1
Fujifilm GFX 100 Pentax K-S1
Mirrorless system camera Digital single lens reflex
Fujifilm G mount lenses Pentax K mount lenses
101.8 MP, Medium Format Sensor 20 MP, APS-C Sensor
4K/30p Video 1080/30p Video
ISO 100-12,800 (50 - 102,400) ISO 100-51,200
Viewfinder optional Optical viewfinder
3.2 LCD, 2360k dots 3.0 LCD, 921k dots
Tilting touchscreen Fixed screen (not touch-sensitive)
5 shutter flaps per second 5.4 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodynot weather sealed
800 shots per battery charge410 shots per battery charge
156 x 144 x 75 mm, 1320 g 121 x 93 x 70 mm, 558 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm GFX 100 and the Pentax K-S1? 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

The side-by-side display below illustrates the physical size and weight of the Fujifilm GFX 100 and the Pentax K-S1. 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.

The K-S1 can be obtained in four different colors (black, grey, orange, white), while the GFX 100 is only available in black.

Size Fujifilm GFX 100 vs Pentax K-S1
Compare GFX 100 versus K-S1 top
Comparison GFX 100 or K-S1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-S1 is considerably smaller (50 percent) than the Fujifilm GFX 100. Moreover, the K-S1 is substantially lighter (58 percent) than the GFX 100. It is worth mentioning in this context that the GFX 100 is splash and dust resistant, while the K-S1 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 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 100 gets 800 shots out of its NP-T125 battery, while the K-S1 can take 410 images on a single charge of its D-LI109 power pack. As can be seen in the images above, the GFX 100 has a battery grip built in. This facilitates image-taking in portrait orientation and gives it additional battery power. The power pack in the GFX 100 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. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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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 100 156 mm 144 mm 75 mm 1320 g 800 Y May 2019 9,999 i
2.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 749 i
3.
 
Fujifilm GFX 100S 150 mm 104 mm 87 mm 900 g 460 Y Jan 2021 5,999 i
4.
 
Fujifilm X-T4 135 mm 93 mm 64 mm 607 g 500 Y Feb 2020 1,699 i
5.
 
Fujifilm XP140 110 mm 71 mm 28 mm 207 g 240 Y Feb 2019 229 i
6.
 
Fujifilm X-H1 140 mm 97 mm 86 mm 673 g 310 Y Feb 2018 1,899 i
7.
 
Fujifilm GFX 50R 161 mm 97 mm 66 mm 775 g 400 Y Sep 2018 4,499 i
8.
 
Nikon Z6 134 mm 101 mm 67 mm 675 g 310 Y Aug 2018 1,999 i
9.
 
Nikon Z7 134 mm 101 mm 67 mm 675 g 330 Y Aug 2018 3,399 i
10.
 
Nikon D5300 125 mm 98 mm 76 mm 480 g 600 n Oct 2013 799 i
11.
 
Olympus E-M1X 144 mm 147 mm 75 mm 997 g 870 Y Jan 2019 2,999 i
12.
 
Pentax K-1 II 137 mm 110 mm 86 mm 1010 g 670 Y Feb 2018 1,999 i
13.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749 i
14.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 549 i
15.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299 i
16.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 i
17.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. 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 K-S1 was launched at a markedly lower price (by 93 percent) than the GFX 100, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. 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 size of the sensor inside a digital camera is one of the key determinants 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. 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 Fujifilm GFX 100 features a medium format sensor and the Pentax K-S1 an APS-C sensor. The sensor area in the K-S1 is 75 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.5. The sensor in the GFX 100 has a native 4:3 aspect ratio, while the one in the K-S1 offers a 3:2 aspect.

Fujifilm GFX 100 and Pentax K-S1 sensor measures

With 101.8MP, the GFX 100 offers a higher resolution than the K-S1 (20MP), but the GFX 100 has smaller individual pixels (pixel pitch of 3.76μm versus 4.28μm for the K-S1). However, the GFX 100 is a much more recent model (by 4 years and 8 months) than the K-S1, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels. 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 100 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the GFX 100 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 K-S1 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 GFX 100 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Fujifilm GFX 100 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 K-S1 are ISO 100 to ISO 51200 (no boost).

GFX 100 versus K-S1 MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-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 100 Medium Format 101.8 11648 87364K/30p...... ..
2.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.01061 78
3.
 
Fujifilm GFX 100S Medium Format 101.8 11648 87364K/30p...... ..
4.
 
Fujifilm X-T4 APS-C 26.0 6240 41604K/60p...... ..
5.
 
Fujifilm XP140 1/2.3 15.9 4608 34564K/15p...... ..
6.
 
Fujifilm X-H1 APS-C 24.0 6000 40004K/30p...... ..
7.
 
Fujifilm GFX 50R Medium Format 51.1 8256 61921080/30p...... ..
8.
 
Nikon Z6 Full Frame 24.3 6048 40244K/30p25.314.33299 95
9.
 
Nikon Z7 Full Frame 45.4 8256 55044K/30p26.314.62668 99
10.
 
Nikon D5300 APS-C 24.0 6000 40001080/60p24.013.91338 83
11.
 
Olympus E-M1X Four Thirds 20.2 5184 38884K/30p...... ..
12.
 
Pentax K-1 II Full Frame 36.2 7360 49121080/60i...... ..
13.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p...... ..
14.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.11087 79
15.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.41216 80
16.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.73730 96
17.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.5701 79

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the GFX 100 provides a higher video resolution than the K-S1. It can shoot video footage at 4K/30p, while the Pentax is limited to 1080/30p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the K-S1 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the GFX 100 relies on live view and the rear LCD for framing. That said, the GFX 100 can be equipped with an optional viewfinder – the EVF-GFX2. The adjacent table lists some of the other core features of the Fujifilm GFX 100 and Pentax K-S1 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 100optional Y 3.2 2360 tilting Y 1/4000s 5.0 n Y
2.
 
Pentax K-S1optical n 3.0 921 fixed n 1/6000s 5.4 Y Y
3.
 
Fujifilm GFX 100S3690 Y 3.2 2360 full-flex Y 1/4000s 5.0 n Y
4.
 
Fujifilm X-T43690 n 3.0 1620 swivel Y 1/8000s 15.0 n Y
5.
 
Fujifilm XP140none n 3.0 920 fixed n 1/2000s 10.0 Y Y
6.
 
Fujifilm X-H13690 Y 3.0 1040 full-flex Y 1/8000s 14.0 n Y
7.
 
Fujifilm GFX 50R3690 n 3.2 2360 tilting Y 1/4000s 3.0 n n
8.
 
Nikon Z63690 Y 3.2 2100 tilting Y 1/8000s 12.0 n Y
9.
 
Nikon Z73690 Y 3.2 2100 tilting Y 1/8000s 9.0 n Y
10.
 
Nikon D5300optical n 3.2 1037 swivel n 1/4000s 5.0 Y n
11.
 
Olympus E-M1X2360 n 3.0 1037 swivel Y 1/8000s 18.0 n Y
12.
 
Pentax K-1 IIoptical Y 3.2 1037 full-flex n 1/8000s 4.4 n Y
13.
 
Pentax K-S2optical n 3.0 921 swivel n 1/6000s 5.4 Y Y
14.
 
Pentax K-500optical n 3.0 921 fixed n 1/6000s 6.0 Y Y
15.
 
Pentax K-3optical Y 3.2 1037 fixed n 1/8000s 8.3 Y Y
16.
 
Sony A7 III2359 n 3.0 922 tilting Y 1/8000s 10.0 n Y
17.
 
Sony A681440 Y 2.7 460 tilting n 1/4000s 8.0 Y Y

One feature that is present on the GFX 100, but is missing on the K-S1 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

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 100 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 100 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.

Concerning the storage of imaging data, both the GFX 100 and the K-S1 write their files to SDXC cards. The GFX 100 features dual card slots, which can be very useful in case a memory card fails. In contrast, the K-S1 only has one slot. The GFX 100 supports UHS-II cards (on both slots), while the K-S1 can use UHS-I 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 100 and Pentax K-S1 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 100YstereomonoYYmicro3.1Y-Y
2.
 
Pentax K-S1Ystereomono--micro2.0---
3.
 
Fujifilm GFX 100SYstereomonoYYmicro3.2Y-Y
4.
 
Fujifilm X-T4YstereomonoY-micro3.1Y-Y
5.
 
Fujifilm XP140-monomono--micro2.0Y-Y
6.
 
Fujifilm X-H1YstereomonoY-micro3.0Y--
7.
 
Fujifilm GFX 50RYstereomonoYYmicro3.0Y-Y
8.
 
Nikon Z6YstereomonoYYmicro3.1Y-Y
9.
 
Nikon Z7YstereomonoYYmicro3.1Y-Y
10.
 
Nikon D5300YstereomonoY-mini2.0Y--
11.
 
Olympus E-M1XYstereomonoYYmicro3.0Y-Y
12.
 
Pentax K-1 IIYstereomonoYYmicro2.0Y--
13.
 
Pentax K-S2YmonomonoY-micro2.0YY-
14.
 
Pentax K-500Ymonomono---2.0---
15.
 
Pentax K-3YmonomonoYYmini3.0---
16.
 
Sony A7 IIIYstereomonoYYmicro3.1YYY
17.
 
Sony A68YstereomonoY-micro2.0---

It is notable that the GFX 100 has a microphone port, which is missing on the K-S1. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.

Studio photographers will appreciate that the Fujifilm GFX 100 (unlike the K-S1) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The GFX 100 is a recent model that features in the current product line-up of Fujifilm. In contrast, the K-S1 has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the K-S1 was succeeded by the Pentax K-S2. 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 conclusions can be drawn? Is the Fujifilm GFX 100 better than the Pentax K-S1 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Fujifilm GFX 100:

  • More detail: Offers more megapixels (101.8 vs 20MP) with a 121% higher linear resolution.
  • Better image quality: Features a larger and more technologically advanced imaging sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/30p).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • 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 tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More portrait friendly: Features an integrated vertical grip for easier portrait shooting.
  • Longer lasting: Can take more shots (800 versus 410) on a single battery charge.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Faster data transfer: Supports a more advanced USB protocol (3.1 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.
  • 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.
  • Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
  • More modern: Reflects 4 years and 8 months of technical progress since the K-S1 launch.

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Advantages of the Pentax K-S1:

  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Faster shutter: Has higher mechanical shutter speed (1/6000s vs 1/4000s) to freeze action.
  • More compact: Is smaller (121x93mm vs 156x144mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 762g or 58 percent) and is thus easier to take along.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • More affordable: Was introduced into a lower priced category (93 percent cheaper at launch).
  • More heavily discounted: Has been around for much longer (launched in August 2014).

If the count of individual advantages (bullet points above) is taken as a guide, the GFX 100 is the clear winner of the match-up (28 : 7 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

GFX 100 28:07 K-S1

How about other alternatives? Do the specifications of the Fujifilm GFX 100 and the Pentax K-S1 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 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 GFX 100 or the K-S1. 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

This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear 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 1004.5/5+ +90/1005/54.5/5 May 2019 9,999 i
2.
 
Pentax K-S14/5....4.5/54/5 Aug 2014 749 i
3.
 
Fujifilm GFX 100S5/5..90/100..5/5 Jan 2021 5,999 i
4.
 
Fujifilm X-T45/5+ +..5/55/5 Feb 2020 1,699 i
5.
 
Fujifilm XP140..+..3.5/54/5 Feb 2019 229 i
6.
 
Fujifilm X-H1..+86/1004.5/54.5/5 Feb 2018 1,899 i
7.
 
Fujifilm GFX 50R5/5..84/1004.5/54.5/5 Sep 2018 4,499 i
8.
 
Nikon Z65/5....4.5/55/5 Aug 2018 1,999 i
9.
 
Nikon Z75/5+89/1004.5/55/5 Aug 2018 3,399 i
10.
 
Nikon D53004/5+ +79/1004.5/54.5/5 Oct 2013 799 i
11.
 
Olympus E-M1X4.5/5o..4.5/5.. Jan 2019 2,999 i
12.
 
Pentax K-1 II....79/1004.5/54.5/5 Feb 2018 1,999 i
13.
 
Pentax K-S24.5/5....5/54.5/5 Feb 2015 749 i
14.
 
Pentax K-500......4.5/54.5/5 Jun 2013 549 i
15.
 
Pentax K-34/5..83/1005/55/5 Oct 2013 1,299 i
16.
 
Sony A7 III..+ +89/1005/55/5 Feb 2018 1,999 i
17.
 
Sony A683/5....4/54/5 Nov 2015 699 i
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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, 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.

Fujifilm GFX 100:
Check Amazon price
Pentax K-S1:
Check Ebay offers

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. 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 100 vs Pentax K-S1

    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 100 Pentax K-S1
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Fujifilm G mount lenses Pentax K mount lenses
    Launch Date May 2019 August 2014
    Launch Price USD 9,999 USD 749
    Sensor Specs Fujifilm GFX 100 Pentax K-S1
    Sensor Technology BSI-CMOS CMOS
    Sensor Format Medium Format Sensor APS-C Sensor
    Sensor Size 43.8 x 32.9 mm 23.5 x 15.6 mm
    Sensor Area 1441.02 mm2 366.6 mm2
    Sensor Diagonal 54.8 mm 28.2 mm
    Crop Factor 0.79x 1.5x
    Sensor Resolution 101.8 Megapixels 20 Megapixels
    Image Resolution 11648 x 8736 pixels 5472 x 3648 pixels
    Pixel Pitch 3.76 μm 4.28 μm
    Pixel Density 7.06 MP/cm2 5.45 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 1080/30p Video
    ISO Setting 100 - 12,800 ISO 100 - 51,200 ISO
    ISO Boost 50 - 102,400 ISO no Enhancement
    Image Processor X-Processor 4 PRIME MII
    DXO Sensor Quality (score) .. 78
    DXO Color Depth (bits) .. 23.5
    DXO Dynamic Range (EV) .. 13.0
    DXO Low Light (ISO) .. 1061
    Screen Specs Fujifilm GFX 100 Pentax K-S1
    Viewfinder Type Viewfinder optional Optical viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.63x
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.2inch 3.0inch
    LCD Resolution 2360k dots 921k dots
    LCD Attachment Tilting screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Fujifilm GFX 100 Pentax K-S1
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/6000s
    Continuous Shooting 5 shutter flaps/s 5.4 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash Build-in Flash
    Storage Medium SDXC cards SDXC cards
    Second Storage Option Dual card slots Single card slot
    UHS card support Dual UHS-II UHS-I
    Connectivity Specs Fujifilm GFX 100 Pentax K-S1
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 3.1 USB 2.0
    HDMI Port micro HDMI micro 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 100 Pentax K-S1
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type NP-T125 D-LI109
    Battery Life (CIPA)800 shots per charge410 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 156 x 144 x 75 mm
    (6.1 x 5.7 x 3.0 in)
    121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    Camera Weight 1320 g (46.6 oz) 558 g (19.7 oz)

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