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Pentax K-3 III vs K-S1

The Pentax K-3 III and the Pentax K-S1 are two digital cameras that were announced, respectively, in March 2021 and August 2014. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The K-3 III has a resolution of 25.6 megapixels, whereas the K-S1 provides 20 MP.

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

Headline Specifications
Pentax K-3 III
versus
Pentax K-S1
Pentax K-3 III   Pentax K-S1
Digital single lens reflex Digital single lens reflex
Pentax K mount lenses Pentax K mount lenses
25.6 MP – APS-C sensor 20 MP – APS-C sensor
4K/30p Video 1080/30p Video
ISO 100-160,000 ISO 100-51,200
Optical viewfinder Optical viewfinder
3.2" LCD – 1620k dots 3.0" LCD – 921k dots
Fixed touchscreen Fixed screen (not touch-sensitive)
12 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
135 x 104 x 74 mm, 820 g 121 x 93 x 70 mm, 558 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-3 III 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.

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Body comparison

An illustration of the physical size and weight of the Pentax K-3 III and the Pentax K-S1 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.

The K-3 III can be obtained in two different colors (black, silver), while the K-S1 is available in four color-versions (black, grey, orange, white).

Size Pentax K-3 III vs Pentax K-S1
Compare K-3 III versus K-S1 top
Comparison K-3 III 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 (20 percent) than the Pentax K-3 III. Moreover, the K-S1 is markedly lighter (32 percent) than the K-3 III. It is worth mentioning in this context that the K-3 III 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 K-3 III gets 800 shots out of its Pentax D-LI90 battery, while the K-S1 can take 410 images on a single charge of its Pentax D-LI109 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax K-3 III 135 mm 104 mm 74 mm 820 g 800 Y Mar 2021 US$ 1 999 amazon.com
2.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 US$ 749ebay.com
3.
 
Fujifilm X-H1 140 mm 97 mm 86 mm 673 g 310 Y Feb 2018 US$ 1 899ebay.com
4.
 
Fujifilm X-T4 135 mm 93 mm 64 mm 607 g 500 Y Feb 2020 US$ 1 699ebay.com
5.
 
Nikon D5300 125 mm 98 mm 76 mm 480 g 600 n Oct 2013 US$ 799ebay.com
6.
 
Nikon D5500 124 mm 97 mm 70 mm 470 g 820 n Jan 2015 US$ 899ebay.com
7.
 
Nikon Z6 II 134 mm 101 mm 70 mm 705 g 410 Y Oct 2020 US$ 1 999 amazon.com
8.
 
Panasonic S5 133 mm 98 mm 82 mm 714 g 440 Y Sep 2020 US$ 1 999 amazon.com
9.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 US$ 1 299ebay.com
10.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 US$ 1 099ebay.com
11.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 US$ 1 099ebay.com
12.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 US$ 649ebay.com
13.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 US$ 549ebay.com
14.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 US$ 1 099ebay.com
15.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 US$ 749ebay.com
16.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 US$ 699ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The K-S1 was launched at a markedly lower price (by 63 percent) than the K-3 III, 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The size of the imaging sensor is a crucial determinant 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. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the K-S1 is 2 percent bigger. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

In terms of chip-set technology, the K-3 III uses a more advanced image processing engine (PRIME V) than the K-S1 (PRIME MII), with benefits for noise reduction, color accuracy, and processing speed.

Pentax K-3 III and Pentax K-S1 sensor measures

Despite having a slightly smaller sensor, the Pentax K-3 III offers a higher resolution of 25.6 megapixels, compared with 20 MP of the Pentax K-S1. 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 4.28μm for the K-S1). However, it should be noted that the K-3 III is much more recent (by 6 years and 7 months) than the K-S1, 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 Pentax K-3 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-3 III for good quality output (200 dots per inch) amounts to 31 x 20.6 inches or 78.6 x 52.4 cm, for very good quality (250 dpi) 24.8 x 16.5 inches or 62.9 x 41.9 cm, and for excellent quality (300 dpi) 20.6 x 13.8 inches or 52.4 x 35 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.

Unlike the K-S1, the K-3 III 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 Pentax K-3 III has a native sensitivity range from ISO 100 to ISO 160000. The corresponding ISO settings for the Pentax K-S1 are ISO 100 to ISO 51200 (no boost).

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

K-3 III versus K-S1 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). 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
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p24.213.7208385
2.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.0106178
3.
 
Fujifilm X-H1 APS-C 24.0 6000 40004K/30p24.013.3180682
4.
 
Fujifilm X-T4 APS-C 26.0 6240 41604K/60p24.113.6199584
5.
 
Nikon D5300 APS-C 24.0 6000 40001080/60p24.013.9133883
6.
 
Nikon D5500 APS-C 24.0 6000 40001080/60p24.114.0143884
7.
 
Nikon Z6 II Full Frame 24.3 6048 40244K/60p25.014.4330394
8.
 
Panasonic S5 Full Frame 24.0 6000 40004K/60p25.114.5269794
9.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
10.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
11.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
12.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i23.813.1163980
13.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
14.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
15.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p23.612.9151479
16.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the K-3 III provides a higher video resolution than the K-S1. It can shoot video footage at 4K/30p, while the K-S1 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. The K-3 III and the K-S1 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the K-3 III has a higher magnification than the one of the K-S1 (0.70x vs 0.63x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The table below summarizes some of the other core capabilities of the Pentax K-3 III and Pentax K-S1 in connection with corresponding information for a sample of similar cameras.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Pentax K-3 IIIoptical Y3.2 / 1620 fixed Y 1/8000s 12.0/s n Y
2.
 
Pentax K-S1optical n3.0 / 921 fixed n 1/6000s 5.4/s Y Y
3.
 
Fujifilm X-H13690 Y3.0 / 1040 full-flex Y 1/8000s 14.0/s n Y
4.
 
Fujifilm X-T43690 n3.0 / 1620 swivel Y 1/8000s 15.0/s n Y
5.
 
Nikon D5300optical n3.2 / 1037 swivel n 1/4000s 5.0/s Y n
6.
 
Nikon D5500optical n3.2 / 1037 swivel Y 1/4000s 5.0/s Y n
7.
 
Nikon Z6 II3690 Y3.2 / 2100 tilting Y 1/8000s 14.0/s n Y
8.
 
Panasonic S52360 n3.0 / 1840 swivel Y 1/8000s 7.0/s n Y
9.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
10.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
11.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
12.
 
Pentax K-70optical n3.0 / 921 swivel n 1/6000s 6.0/s Y Y
13.
 
Pentax K-500optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
14.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y Y
15.
 
Pentax K-S2optical n3.0 / 921 swivel n 1/6000s 5.4/s Y Y
16.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the K-3 III, 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 Pentax K-3 III 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 K-3 III and the K-S1 write their files to SDXC cards. The K-3 III 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 K-3 III supports UHS-II cards (on its first slot), 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 Pentax K-3 III 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
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
2.
 
Pentax K-S1Ystereo / mono--micro2.0---
3.
 
Fujifilm X-H1Ystereo / monoY-micro3.0Y--
4.
 
Fujifilm X-T4Ystereo / monoY-micro3.1Y-Y
5.
 
Nikon D5300Ystereo / monoY-mini2.0Y--
6.
 
Nikon D5500Ystereo / monoY-mini2.0Y--
7.
 
Nikon Z6 IIYstereo / monoYYmicro3.2Y-Y
8.
 
Panasonic S5Ystereo / monoYYmicro3.2Y-Y
9.
 
Pentax K-3Ymono / monoYYmini3.0---
10.
 
Pentax K-3 IIYmono / monoYYmini3.0---
11.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
12.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
13.
 
Pentax K-500Ymono / mono---2.0---
14.
 
Pentax KPYstereo / monoY--2.0Y--
15.
 
Pentax K-S2Ymono / monoY-micro2.0YY-
16.
 
Sony A68Ystereo / monoY-micro2.0---

It is notable that the K-3 III 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 Pentax K-3 III (unlike the K-S1) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Travel and landscape photographers will find it useful that the K-3 III has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

The K-3 III is a recent model that features in the current product line-up of Pentax. 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 features and operation of the K-3 III and K-S1 can be found, respectively, in the Pentax K-3 III Manual (free pdf) or the online Pentax K-S1 Manual.

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Review summary

So what conclusions can be drawn? Is the Pentax K-3 III better than the Pentax K-S1 or vice versa? The listing below highlights the relative strengths of the two models.


Advantages of the Pentax K-3 III:

  • More detail: Offers more megapixels (25.6 vs 20MP) with a 13% higher linear resolution.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better jpgs: Has a more modern image processing engine (PRIME V vs PRIME MII).
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/30p).
  • 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.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.70x vs 0.63x).
  • 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 (1620k vs 921k dots).
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/6000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 5.4 flaps/sec) to capture the decisive moment.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Can take more shots (800 versus 410) on a single battery charge.
  • Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • 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.
  • 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 6 years and 7 months of technical progress since the K-S1 launch.


Reasons to prefer the Pentax K-S1:

  • More compact: Is smaller (121x93mm vs 135x104mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 262g or 32 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 (63 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 K-3 III is the clear winner of the match-up (24 : 5 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding 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.

K-3 III 24:05 K-S1

How about other alternatives? Do the specifications of the Pentax K-3 III and the Pentax K-S1 place the cameras among the top in their class? Find out in the latest Best DSLR Camera listing whether the two cameras rank among the cream of the crop.

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 K-3 III or the K-S1 perform in practice. 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 following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], 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
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax K-3 III4/5..3/5..4.5/5.. Mar 2021 US$ 1 999 amazon.com
2.
 
Pentax K-S14/5......4.5/54/5 Aug 2014 US$ 749ebay.com
3.
 
Fujifilm X-H1..+5/586/1004.5/54.5/5 Feb 2018 US$ 1 899ebay.com
4.
 
Fujifilm X-T45/5+ +5/588/1005/55/5 Feb 2020 US$ 1 699ebay.com
5.
 
Nikon D53004/5+ +..79/1004.5/54.5/5 Oct 2013 US$ 799ebay.com
6.
 
Nikon D55005/5+..79/1004.5/54.5/5 Jan 2015 US$ 899ebay.com
7.
 
Nikon Z6 II4.5/5..4/589/1004.5/54.5/5 Oct 2020 US$ 1 999 amazon.com
8.
 
Panasonic S54.5/5+ +4.5/588/1004.5/54.5/5 Sep 2020 US$ 1 999 amazon.com
9.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 US$ 1 299ebay.com
10.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 US$ 1 099ebay.com
11.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 US$ 1 099ebay.com
12.
 
Pentax K-704.5/5..4/579/1004.5/54.5/5 Jun 2016 US$ 649ebay.com
13.
 
Pentax K-500........4.5/54.5/5 Jun 2013 US$ 549ebay.com
14.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 US$ 1 099ebay.com
15.
 
Pentax K-S24.5/5......5/54.5/5 Feb 2015 US$ 749ebay.com
16.
 
Sony A683/5......4/54/5 Nov 2015 US$ 699ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

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 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.

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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.

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    Specifications: Pentax K-3 III 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 Pentax K-3 III Pentax K-S1
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Pentax K mount lenses Pentax K mount lenses
    Launch Date March 2021 August 2014
    Launch Price USD 1,999 USD 749
    Sensor Specs Pentax K-3 III Pentax K-S1
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 23.3 x 15.5 mm 23.5 x 15.6 mm
    Sensor Area 361.15 mm2 366.6 mm2
    Sensor Diagonal 28 mm 28.2 mm
    Crop Factor 1.5x 1.5x
    Sensor Resolution 25.6 Megapixels 20 Megapixels
    Image Resolution 6192 x 4128 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/30p Video 1080/30p Video
    ISO Setting 100 - 160,000 ISO 100 - 51,200 ISO
    Image Processor PRIME V 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 Pentax K-3 III Pentax K-S1
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.70x 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 1620k dots 921k dots
    LCD Attachment Fixed screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Pentax K-3 III Pentax K-S1
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/6000s
    Continuous Shooting 12 shutter flaps/s 5.4 shutter flaps/s
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash Built-in Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Dual card slots Single card slot
    UHS card support Single UHS-II UHS-I
    Connectivity Specs Pentax K-3 III Pentax K-S1
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 3.2 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
    Geotagging GPS built-in no internal GPS
    Body Specs Pentax K-3 III Pentax K-S1
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type Pentax D-LI90 Pentax D-LI109
    Battery Life (CIPA)800 shots per charge410 shots per charge
    Body Dimensions 135 x 104 x 74 mm
    (5.3 x 4.1 x 2.9 in)
    121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    Camera Weight 820 g (28.9 oz) 558 g (19.7 oz)
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