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Fujifilm X-T4 vs Pentax K-S1

The Fujifilm X-T4 and the Pentax K-S1 are two digital cameras that were revealed to the public, respectively, in February 2020 and August 2014. The X-T4 is a mirrorless interchangeable lens camera, while the K-S1 is a DSLR. Both cameras are equipped with an APS-C sensor. The Fujifilm has a resolution of 26 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 X-T4 versus Pentax K-S1
Fujifilm X-T4 Pentax K-S1
Mirrorless system camera Digital single lens reflex
Fujifilm X mount lenses Pentax K mount lenses
26 MP, APS-C Sensor 20 MP, APS-C Sensor
4K/60p Video 1080/30p Video
ISO 160-12,800 (80 - 51,200) ISO 100-51,200
Electronic viewfinder (3690k dots) Optical viewfinder
3.0 LCD, 1620k dots 3.0 LCD, 921k dots
Swivel touchscreen Fixed screen (not touch-sensitive)
15 shutter flaps per second 5.4 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodynot weather sealed
500 shots per battery charge410 shots per battery charge
135 x 93 x 64 mm, 607 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 X-T4 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 X-T4 and the Pentax K-S1. 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 dimensions are rounded to the nearest millimeter.

The X-T4 can be obtained in two different colors (black, silver), while the K-S1 is available in four color-versions (black, grey, orange, white).

Size Fujifilm X-T4 vs Pentax K-S1
Compare X-T4 versus K-S1 top
Comparison X-T4 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 notably smaller (10 percent) than the Fujifilm X-T4. Moreover, the K-S1 is markedly lighter (8 percent) than the X-T4. It is worth mentioning in this context that the X-T4 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 X-T4 gets 500 shots out of its NP-W235 battery, while the K-S1 can take 410 images on a single charge of its D-LI109 power pack. The power pack in the X-T4 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. 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 X-T4 135 mm 93 mm 64 mm 607 g 500 Y Feb 2020 1,699 i
2.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 749i
3.
 
Fujifilm X-Pro3 141 mm 83 mm 46 mm 497 g 440 Y Oct 2019 1,799 i
4.
 
Fujifilm X-T3 133 mm 93 mm 59 mm 539 g 390 Y Sep 2018 1,499i
5.
 
Fujifilm X-H1 140 mm 97 mm 86 mm 673 g 310 Y Feb 2018 1,899 i
6.
 
Fujifilm X-Pro2 141 mm 83 mm 46 mm 495 g 350 Y Jan 2016 1,699 i
7.
 
Fujifilm X-T2 133 mm 92 mm 49 mm 507 g 340 Y Jul 2016 1,599i
8.
 
Nikon Z5 134 mm 101 mm 67 mm 675 g 470 Y Jul 2020 1,399 i
9.
 
Nikon Z6 II 134 mm 101 mm 70 mm 705 g 410 Y Oct 2020 1,999 i
10.
 
Nikon D5300 125 mm 98 mm 76 mm 480 g 600 n Oct 2013 799i
11.
 
Panasonic S5 133 mm 98 mm 82 mm 714 g 440 Y Sep 2020 1,999 i
12.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749 i
13.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 549i
14.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299i
15.
 
Sony A7C 124 mm 71 mm 60 mm 509 g 740 Y Sep 2020 1,799 i
16.
 
Sony A6600 120 mm 67 mm 69 mm 503 g 810 Y Aug 2019 1,399 i
17.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699i
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 56 percent) than the X-T4, 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.

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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. 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. 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.5. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Fujifilm X-T4 and Pentax K-S1 sensor measures

While the two cameras under review share the same sensor size, the X-T4 offers a higher resolution of 26 megapixels, compared with 20 MP of the K-S1. This megapixels advantage translates into a 14 percent gain in linear resolution. On the other hand, these sensor specs imply that the X-T4 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 4.28μm for the K-S1). In this context, it should be noted, however, that the X-T4 is much more recent (by 5 years and 6 months) than the K-S1, and its sensor will have benefitted from technological advances during this time that compensate for the smaller pixel size. 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 X-T4 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the X-T4 for good quality output (200 dots per inch) amounts to 31.2 x 20.8 inches or 79.2 x 52.8 cm, for very good quality (250 dpi) 25 x 16.6 inches or 63.4 x 42.3 cm, and for excellent quality (300 dpi) 20.8 x 13.9 inches or 52.8 x 35.2 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 X-T4 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Fujifilm X-T4 has a native sensitivity range from ISO 160 to ISO 12800, which can be extended to ISO 80-51200. The corresponding ISO settings for the Pentax K-S1 are ISO 100 to ISO 51200 (no boost).

X-T4 versus K-S1 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.

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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 X-T4 APS-C 26.0 6240 41604K/60p........
2.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.0106178
3.
 
Fujifilm X-Pro3 APS-C 26.0 6240 41604K/30p........
4.
 
Fujifilm X-T3 APS-C 26.0 6240 41604K/60p........
5.
 
Fujifilm X-H1 APS-C 24.0 6000 40004K/30p........
6.
 
Fujifilm X-Pro2 APS-C 24.0 6000 40001080/60p........
7.
 
Fujifilm X-T2 APS-C 24.0 6000 40004K/30p........
8.
 
Nikon Z5 Full Frame 24.2 6016 40164K/30p........
9.
 
Nikon Z6 II Full Frame 24.3 6048 40244K/60p........
10.
 
Nikon D5300 APS-C 24.0 6000 40001080/60p24.013.9133883
11.
 
Panasonic S5 Full Frame 24.0 6000 40004K/60p........
12.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p........
13.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
14.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
15.
 
Sony A7C Full Frame 24.0 6000 40004K/30p25.014.7340795
16.
 
Sony A6600 APS-C 24.0 6000 40004K/30p23.813.4149782
17.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179

Many modern cameras cannot only take still pictures, but also record videos. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the X-T4 provides a higher video resolution than the K-S1. It can shoot video footage at 4K/60p, 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 variety of features. For example, the X-T4 has an electronic viewfinder (3690k dots), while the K-S1 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 field of view (100%), but the viewfinder of the X-T4 has a higher magnification than the one of the K-S1 (0.75x vs 0.63x), 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 X-T4 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 X-T43690 n 3.0 1620 swivel Y 1/8000s 15.0 n Y
2.
 
Pentax K-S1optical n 3.0 921 fixed n 1/6000s 5.4 Y Y
3.
 
Fujifilm X-Pro33690 n 3.0 1620 tilting Y 1/8000s 8.0 n n
4.
 
Fujifilm X-T33690 n 3.0 1040 tilting Y 1/8000s 11.0 n n
5.
 
Fujifilm X-H13690 Y 3.0 1040 full-flex Y 1/8000s 14.0 n Y
6.
 
Fujifilm X-Pro22360 n 3.0 1620 fixed n 1/8000s 8.0 n n
7.
 
Fujifilm X-T22360 n 3.0 1040 tilting n 1/8000s 8.0 n n
8.
 
Nikon Z53690 n 3.2 1040 tilting Y 1/8000s 4.5 n Y
9.
 
Nikon Z6 II3690 Y 3.2 2100 tilting Y 1/8000s 14.0 n Y
10.
 
Nikon D5300optical n 3.2 1037 swivel n 1/4000s 5.0 Y n
11.
 
Panasonic S52360 n 3.0 1840 full-flex Y 1/8000s 7.0 n Y
12.
 
Pentax K-S2optical n 3.0 921 swivel n 1/6000s 5.4 Y Y
13.
 
Pentax K-500optical n 3.0 921 fixed n 1/6000s 6.0 Y Y
14.
 
Pentax K-3optical Y 3.2 1037 fixed n 1/8000s 8.3 Y Y
15.
 
Sony A7C2360 n 3.0 922 swivel Y 1/4000s 10.0 n Y
16.
 
Sony A66002359 n 3.0 922 tilting Y 1/4000s 11.0 n Y
17.
 
Sony A681440 Y 2.7 460 tilting n 1/4000s 8.0 Y Y

One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The X-T4 has a touchscreen, while the K-S1 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

The X-T4 has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the K-S1 does not have a selfie-screen.

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 X-T4 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 X-T4 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 X-T4 and the K-S1 write their files to SDXC cards. The X-T4 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 X-T4 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 X-T4 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 X-T4YstereomonoY-micro3.1Y-Y
2.
 
Pentax K-S1Ystereomono--micro2.0---
3.
 
Fujifilm X-Pro3YstereomonoY--3.1Y-Y
4.
 
Fujifilm X-T3YstereomonoYYmicro3.1Y-Y
5.
 
Fujifilm X-H1YstereomonoY-micro3.0Y--
6.
 
Fujifilm X-Pro2YstereomonoY-micro2.0Y--
7.
 
Fujifilm X-T2YstereomonoY-micro3.0Y--
8.
 
Nikon Z5YstereomonoYYmicro3.2Y-Y
9.
 
Nikon Z6 IIYstereomonoYYmicro3.2Y-Y
10.
 
Nikon D5300YstereomonoY-mini2.0Y--
11.
 
Panasonic S5YstereomonoYYmicro3.2Y-Y
12.
 
Pentax K-S2YmonomonoY-micro2.0YY-
13.
 
Pentax K-500Ymonomono---2.0---
14.
 
Pentax K-3YmonomonoYYmini3.0---
15.
 
Sony A7CYstereomonoYYmicro3.2YYY
16.
 
Sony A6600YstereomonoYYYES2.0YYY
17.
 
Sony A68YstereomonoY-micro2.0---

It is notable that the X-T4 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 X-T4 (unlike the K-S1) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The X-T4 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 there a clear favorite between the Fujifilm X-T4 and the Pentax K-S1? Which camera is better? The listing below highlights the relative strengths of the two models.

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Advantages of the Fujifilm X-T4:

  • More detail: Offers more megapixels (26 vs 20MP) with a 14% higher linear resolution.
  • Better video: Provides higher definition movie capture (4K/60p 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.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.75x vs 0.63x).
  • More detailed LCD: Has a higher resolution rear screen (1620k vs 921k dots).
  • More flexible LCD: Has a swivel 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.
  • 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 1/6000s) to freeze action.
  • Faster burst: Shoots at higher frequency (15 vs 5.4 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Can take more shots (500 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 5 years and 6 months of technical progress since the K-S1 launch.

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Arguments in favor of the Pentax K-S1:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • More affordable: Was introduced into a lower priced category (56 percent cheaper at launch).
  • More heavily discounted: Has been around for much longer (launched in August 2014).

If the number of relative strengths (bullet points above) is taken as a guide, the X-T4 is the clear winner of the match-up (25 : 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 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.

X-T4 25:04 K-S1

How about other alternatives? Do the specifications of the Fujifilm X-T4 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the X-T4 or the K-S1. 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 where reviews by experts come in. 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 X-T45/5+ +..5/55/5 Feb 2020 1,699 i
2.
 
Pentax K-S14/5....4.5/54/5 Aug 2014 749i
3.
 
Fujifilm X-Pro34/5+85/1004/5.. Oct 2019 1,799 i
4.
 
Fujifilm X-T35/5+ +88/1005/55/5 Sep 2018 1,499i
5.
 
Fujifilm X-H1..+86/1004.5/54.5/5 Feb 2018 1,899 i
6.
 
Fujifilm X-Pro2..+83/1004.5/54.5/5 Jan 2016 1,699 i
7.
 
Fujifilm X-T25/5+ +86/1004.5/55/5 Jul 2016 1,599i
8.
 
Nikon Z54/5..89/1004.5/54/5 Jul 2020 1,399 i
9.
 
Nikon Z6 II4.5/5..89/1004.5/54.5/5 Oct 2020 1,999 i
10.
 
Nikon D53004/5+ +79/1004.5/54.5/5 Oct 2013 799i
11.
 
Panasonic S54.5/5+ +..4.5/54.5/5 Sep 2020 1,999 i
12.
 
Pentax K-S24.5/5....5/54.5/5 Feb 2015 749 i
13.
 
Pentax K-500......4.5/54.5/5 Jun 2013 549i
14.
 
Pentax K-34/5..83/1005/55/5 Oct 2013 1,299i
15.
 
Sony A7C3.5/5..86/1004/54/5 Sep 2020 1,799 i
16.
 
Sony A66004/5+83/1004.5/54/5 Aug 2019 1,399 i
17.
 
Sony A683/5....4/54/5 Nov 2015 699i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. 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. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Fujifilm X-T4:
Check Amazon price
Pentax K-S1:
Check Ebay offers

Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. 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 X-T4 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 X-T4 Pentax K-S1
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Fujifilm X mount lenses Pentax K mount lenses
    Launch Date February 2020 August 2014
    Launch Price USD 1,699 USD 749
    Sensor Specs Fujifilm X-T4 Pentax K-S1
    Sensor Technology BSI-CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 23.5 x 15.6 mm 23.5 x 15.6 mm
    Sensor Area 366.6 mm2 366.6 mm2
    Sensor Diagonal 28.2 mm 28.2 mm
    Crop Factor 1.5x 1.5x
    Sensor Resolution 26 Megapixels 20 Megapixels
    Image Resolution 6240 x 4160 pixels 5472 x 3648 pixels
    Pixel Pitch 3.76 μm 4.28 μm
    Pixel Density 7.08 MP/cm2 5.45 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/60p Video 1080/30p Video
    ISO Setting 160 - 12,800 ISO 100 - 51,200 ISO
    ISO Boost 80 - 51,200 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 X-T4 Pentax K-S1
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.75x 0.63x
    Viewfinder Resolution 3690k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1620k dots 921k dots
    LCD Attachment Swivel screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Fujifilm X-T4 Pentax K-S1
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/6000s
    Continuous Shooting 15 shutter flaps/s 5.4 shutter flaps/s
    Electronic Shutterup to 1/32000sno 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 X-T4 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
    Wifi Support Wifi built-in no Wifi
    Bluetooth Support Bluetooth built-in no Bluetooth
    Body Specs Fujifilm X-T4 Pentax K-S1
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type NP-W235 D-LI109
    Battery Life (CIPA)500 shots per charge410 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 135 x 93 x 64 mm
    (5.3 x 3.7 x 2.5 in)
    121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    Camera Weight 607 g (21.4 oz) 558 g (19.7 oz)

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