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Pentax K-S1 vs Sony A7 III

The Pentax K-S1 and the Sony Alpha A7 III are two digital cameras that were officially introduced, respectively, in August 2014 and February 2018. The K-S1 is a DSLR, while the A7 III is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (K-S1) and a full frame (A7 III) sensor. The Pentax has a resolution of 20 megapixels, whereas the Sony provides 24 MP.

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

Headline Specifications
Pentax K-S1 versus Sony A7 III
Pentax K-S1 Sony A7 III
Digital single lens reflex Mirrorless system camera
Pentax K mount lenses Sony E mount lenses
20 MP, APS-C Sensor 24 MP, Full Frame Sensor
1080/30p Video 4K/30p Video
ISO 100-51,200 ISO 100-51,200 (50 - 204,800)
Optical viewfinder Electronic viewfinder (2359k dots)
3.0 LCD, 921k dots 3.0 LCD, 922k dots
Fixed screen (not touch-sensitive) Tilting touchscreen
5.4 shutter flaps per second 10 shutter flaps per second
In-body stabilizationIn-body stabilization
not weather sealedWeathersealed body
410 shots per battery charge610 shots per battery charge
121 x 93 x 70 mm, 558 g 127 x 96 x 74 mm, 650 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-S1 and the Sony Alpha A7 III? 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 physical size and weight of the Pentax K-S1 and the Sony A7 III are illustrated 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.

The K-S1 can be obtained in four different colors (black, grey, orange, white), while the A7 III is only available in black.

Size Pentax K-S1 vs Sony A7 III
Compare K-S1 versus A7 III top
Comparison K-S1 or A7 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7 III is notably larger (8 percent) than the Pentax K-S1. Moreover, the A7 III is markedly heavier (16 percent) than the K-S1. It is noteworthy in this context that the A7 III is splash and dust-proof, 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-S1 gets 410 shots out of its D-LI109 battery, while the A7 III can take 610 images on a single charge of its NP-FZ100 power pack. The power pack in the A7 III can be charged via the USB port, which can be very convenient 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.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 749i
2.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 i
3.
 
Canon 750D 132 mm 101 mm 78 mm 555 g 440 n Feb 2015 749i
4.
 
Canon 760D 132 mm 101 mm 78 mm 565 g 440 n Feb 2015 649i
5.
 
Nikon Z6 134 mm 101 mm 67 mm 675 g 310 Y Aug 2018 1,999i
6.
 
Nikon D5300 125 mm 98 mm 76 mm 480 g 600 n Oct 2013 799i
7.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749 i
8.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099i
9.
 
Pentax K-50 130 mm 97 mm 71 mm 650 g 410 Y Jun 2013 599i
10.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 549i
11.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299i
12.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499 i
13.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199i
14.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499i
15.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699i
16.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999i
17.
 
Sony A58 129 mm 95 mm 78 mm 492 g 690 n Feb 2013 599i
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 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 A7 III, 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.

Of the two cameras under consideration, the Pentax K-S1 features an APS-C sensor and the Sony A7 III a full frame sensor. The sensor area in the A7 III is 131 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Pentax K-S1 and Sony A7 III sensor measures

With 24MP, the A7 III offers a higher resolution than the K-S1 (20MP), but the A7 III nevertheless has larger individual pixels (pixel pitch of 5.94μm versus 4.28μm for the K-S1) due to its larger sensor. Moreover, the A7 III is a much more recent model (by 3 years and 6 months) than the K-S1, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that the K-S1 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Sony A7 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7 III for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 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 A7 III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Pentax K-S1 has a native sensitivity range from ISO 100 to ISO 51200. The corresponding ISO settings for the Sony Alpha A7 III are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.

K-S1 versus A7 III 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. Of the two cameras under consideration, the A7 III offers substantially better image quality than the K-S1 (overall score 18 points higher). The advantage is based on 1.5 bits higher color depth, 1.7 EV in additional dynamic range, and 1.8 stops in additional low light sensitivity. 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.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.0106178
2.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.7373096
3.
 
Canon 750D APS-C 24.0 6000 40001080/30p22.712.091971
4.
 
Canon 760D APS-C 24.0 6000 40001080/30p22.612.091570
5.
 
Nikon Z6 Full Frame 24.3 6048 40244K/30p25.314.3329995
6.
 
Nikon D5300 APS-C 24.0 6000 40001080/60p24.013.9133883
7.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p........
8.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
9.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.0112079
10.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
11.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
12.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.8334499
13.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
14.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.3351792
15.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
16.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
17.
 
Sony A58 APS-C 19.8 5456 36321080/60i23.312.575374

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A7 III provides a better video resolution than the K-S1. It can shoot movie footage at 4K/30p, while the Pentax is limited to 1080/30p.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A7 III has an electronic viewfinder (2359k 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 A7 III has a higher magnification than the one of the K-S1 (0.78x 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 Pentax K-S1 and Sony A7 III 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.
 
Pentax K-S1optical n 3.0 921 fixed n 1/6000s 5.4 Y Y
2.
 
Sony A7 III2359 n 3.0 922 tilting Y 1/8000s 10.0 n Y
3.
 
Canon 750Doptical n 3.0 1040 swivel Y 1/4000s 5.0 Y n
4.
 
Canon 760Doptical Y 3.0 1040 swivel Y 1/4000s 5.0 Y n
5.
 
Nikon Z63690 Y 3.2 2100 tilting Y 1/8000s 12.0 n Y
6.
 
Nikon D5300optical n 3.2 1037 swivel n 1/4000s 5.0 Y n
7.
 
Pentax K-S2optical n 3.0 921 swivel n 1/6000s 5.4 Y Y
8.
 
Pentax K-3 IIoptical Y 3.2 1037 fixed n 1/8000s 8.3 n Y
9.
 
Pentax K-50optical n 3.0 921 fixed n 1/6000s 6.0 Y Y
10.
 
Pentax K-500optical n 3.0 921 fixed n 1/6000s 6.0 Y Y
11.
 
Pentax K-3optical Y 3.2 1037 fixed n 1/8000s 8.3 Y Y
12.
 
Sony A7R IV5760 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
13.
 
Sony A7R III3686 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
14.
 
Sony A93686 n 3.0 1440 tilting Y 1/8000s 20.0 n Y
15.
 
Sony A681440 Y 2.7 460 tilting n 1/4000s 8.0 Y Y
16.
 
Sony A7 II2400 n 3.0 1230 tilting n 1/8000s 5.0 n Y
17.
 
Sony A581440 n 2.7 460 tilting n 1/4000s 5.0 Y Y

One difference between the cameras concerns the presence of an on-board flash. The K-S1 has one, while the A7 III does not. While the built-in flash of the K-S1 is not very powerful, it can at times be useful as a fill-in light.

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 A7 III 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 Sony A7 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.

The K-S1 writes its imaging data to SDXC cards, while the A7 III uses SDXC or Memory Stick PRO Duo cards. The A7 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 A7 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-S1 and Sony Alpha A7 III 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.
 
Pentax K-S1Ystereomono--micro2.0---
2.
 
Sony A7 IIIYstereomonoYYmicro3.1YYY
3.
 
Canon 750DYstereomonoY-mini2.0YY-
4.
 
Canon 760DYstereomonoY-mini2.0YY-
5.
 
Nikon Z6YstereomonoYYmicro3.1Y-Y
6.
 
Nikon D5300YstereomonoY-mini2.0Y--
7.
 
Pentax K-S2YmonomonoY-micro2.0YY-
8.
 
Pentax K-3 IIYmonomonoYYmini3.0---
9.
 
Pentax K-50Ymonomono--micro2.0---
10.
 
Pentax K-500Ymonomono---2.0---
11.
 
Pentax K-3YmonomonoYYmini3.0---
12.
 
Sony A7R IVYstereomonoYYmicro3.1YYY
13.
 
Sony A7R IIIYstereomonoYYmicro3.1YYY
14.
 
Sony A9YstereomonoYYmicro2.0YYY
15.
 
Sony A68YstereomonoY-micro2.0---
16.
 
Sony A7 IIYstereomonoYYmicro2.0YY-
17.
 
Sony A58YstereomonoY-mini2.0---

It is notable that the A7 III offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the K-S1 does not provide wifi capability.

The A7 III is a recent model that features in the current product line-up of Sony. 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 Pentax and Sony websites.

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Review summary

So what is the bottom line? Is the Pentax K-S1 better than the Sony A7 III or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Pentax K-S1:

  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Less heavy: Is lighter (by 92g or 14 percent) and hence easier to carry around.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (63 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in August 2014).

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Arguments in favor of the Sony Alpha A7 III:

  • More detail: Has more megapixels (24 vs 20MP), which boosts linear resolution by 10%.
  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better image quality: Scores substantially higher (18 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.5 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (1.7 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.8 stops ISO advantage).
  • 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.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.63x).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/6000s) to freeze action.
  • Faster burst: Shoots at higher frequency (10 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: Gets more shots (610 versus 410) out of a single battery charge.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • More legacy lens friendly: Can use many 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 device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • 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 3 years and 6 months of technical progress since the K-S1 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the A7 III is the clear winner of the contest (29 : 6 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.

K-S1 06:29 A7 III

How about other alternatives? Do the specifications of the Pentax K-S1 and the Sony A7 III place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens 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 K-S1 and the A7 III 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.
 
Pentax K-S14/5....4.5/54/5 Aug 2014 749i
2.
 
Sony A7 III..+ +89/1005/55/5 Feb 2018 1,999 i
3.
 
Canon 750D5/5..75/1004.5/54.5/5 Feb 2015 749i
4.
 
Canon 760D5/5+77/1004.5/54.5/5 Feb 2015 649i
5.
 
Nikon Z65/5....4.5/55/5 Aug 2018 1,999i
6.
 
Nikon D53004/5+ +79/1004.5/54.5/5 Oct 2013 799i
7.
 
Pentax K-S24.5/5....5/54.5/5 Feb 2015 749 i
8.
 
Pentax K-3 II4.5/5....5/55/5 Apr 2015 1,099i
9.
 
Pentax K-505/5....5/54.5/5 Jun 2013 599i
10.
 
Pentax K-500......4.5/54.5/5 Jun 2013 549i
11.
 
Pentax K-34/5..83/1005/55/5 Oct 2013 1,299i
12.
 
Sony A7R IV5/5+91/1004.5/55/5 Jul 2019 3,499 i
13.
 
Sony A7R III..+ +90/1004.5/55/5 Oct 2017 3,199i
14.
 
Sony A95/5+ +89/1005/55/5 Apr 2017 4,499i
15.
 
Sony A683/5....4/54/5 Nov 2015 699i
16.
 
Sony A7 II5/5+82/1004.5/55/5 Nov 2014 1,999i
17.
 
Sony A583/5....4.5/54.5/5 Feb 2013 599i
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.

Pentax K-S1:
Check Ebay offers
Sony A7 III:
Check Amazon price

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: Pentax K-S1 vs Sony A7 III

    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-S1 Sony A7 III
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax K mount lenses Sony E mount lenses
    Launch Date August 2014 February 2018
    Launch Price USD 749 USD 1,999
    Sensor Specs Pentax K-S1 Sony A7 III
    Sensor Technology CMOS BSI-CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.5 x 15.6 mm 35.6 x 23.8 mm
    Sensor Area 366.6 mm2 847.28 mm2
    Sensor Diagonal 28.2 mm 42.8 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 20 Megapixels 24 Megapixels
    Image Resolution 5472 x 3648 pixels 6000 x 4000 pixels
    Pixel Pitch 4.28 μm 5.94 μm
    Pixel Density 5.45 MP/cm2 2.83 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 1080/30p Video 4K/30p Video
    ISO Setting 100 - 51,200 ISO 100 - 51,200 ISO
    ISO Boost no Enhancement 50 - 204,800 ISO
    Image Processor PRIME MII BIONZ X
    DXO Sensor Quality (score) 78 96
    DXO Color Depth (bits) 23.5 25.0
    DXO Dynamic Range (EV) 13.0 14.7
    DXO Low Light (ISO) 1061 3730
    Screen Specs Pentax K-S1 Sony A7 III
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.78x
    Viewfinder Resolution 2359k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 921k dots 922k dots
    LCD Attachment Fixed screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax K-S1 Sony A7 III
    Focus System Phase-detect AF On-Sensor Phase-detect
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/6000s 1/8000s
    Continuous Shooting 5.4 shutter flaps/s 10 shutter flaps/s
    Electronic Shutterno E-ShutterYES
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Build-in Flash no On-Board Flash
    Storage Medium SDXC cards MS or SDXC cards
    Second Storage Option Single card slot Dual card slots
    UHS card support UHS-I Single UHS-II
    Connectivity Specs Pentax K-S1 Sony A7 III
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 3.1
    HDMI Port micro HDMI micro HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support no Wifi Wifi built-in
    Near-Field Communication no NFC NFC built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Pentax K-S1 Sony A7 III
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type D-LI109 NP-FZ100
    Battery Life (CIPA)410 shots per charge610 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    127 x 96 x 74 mm
    (5.0 x 3.8 x 2.9 in)
    Camera Weight 558 g (19.7 oz) 650 g (22.9 oz)

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