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Pentax K-S2 vs Sony A1

The Pentax K-S2 and the Sony A1 are two digital cameras that were announced, respectively, in February 2015 and January 2021. The K-S2 is a DSLR, while the A1 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (K-S2) and a full frame (A1) sensor. The Pentax has a resolution of 20 megapixels, whereas the Sony provides 49.8 MP.

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

Headline Specifications
Pentax K-S2 versus Sony A1
Pentax K-S2 Sony A1
Digital single lens reflex Mirrorless system camera
Pentax K mount lenses Sony E mount lenses
20 MP, APS-C Sensor 49.8 MP, Full Frame Sensor
1080/30p Video 8k/30p Video
ISO 100-51,200 ISO 100-32,000 (500 - 102,400)
Optical viewfinder Electronic viewfinder (9437k dots)
3.0 LCD, 921k dots 3.0 LCD, 1440k dots
Swivel screen (not touch-sensitive) Tilting touchscreen
5.4 shutter flaps per second 10 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodyWeathersealed body
410 shots per battery charge530 shots per battery charge
123 x 91 x 73 mm, 678 g 129 x 97 x 81 mm, 737 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-S2 and the Sony A1? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

Body comparison

An illustration of the physical size and weight of the Pentax K-S2 and the Sony A1 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-S2 can be obtained in six different colors (black, grey, pink, orange, green, white), while the A1 is only available in black.

Size Pentax K-S2 vs Sony A1
Compare K-S2 versus A1 top
Comparison K-S2 or A1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A1 is notably larger (12 percent) than the Pentax K-S2. Moreover, the A1 is markedly heavier (9 percent) than the K-S2. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the K-S2 gets 410 shots out of its D-LI109 battery, while the A1 can take 530 images on a single charge of its NP-FZ100 power pack. The power pack in the A1 can be charged via the USB port, which can be very convenient 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.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749 i
2.
 
Sony A1 129 mm 97 mm 81 mm 737 g 530 Y Jan 2021 6,499 i
3.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 1,099 i
4.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 649 i
5.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099 i
6.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 749 i
7.
 
Pentax K-50 130 mm 97 mm 71 mm 650 g 410 Y Jun 2013 599 i
8.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299 i
9.
 
Pentax K-30 130 mm 97 mm 71 mm 650 g 410 Y May 2012 849 i
10.
 
Pentax K-5 131 mm 97 mm 73 mm 760 g 740 Y Sep 2010 1,099 i
11.
 
Sony A7S III 127 mm 97 mm 81 mm 699 g 600 Y Jul 2020 3,499 i
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 3,199 i
14.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499 i
15.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199 i
16.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699 i
17.
 
Sony A77 II 143 mm 104 mm 81 mm 647 g 480 Y May 2014 1,199 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The K-S2 was launched at a markedly lower price (by 88 percent) than the A1, 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. 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 associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Pentax K-S2 features an APS-C sensor and the Sony A1 a full frame sensor. The sensor area in the A1 is 135 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-S2 and Sony A1 sensor measures

With 49.8MP, the A1 offers a higher resolution than the K-S2 (20MP), but the A1 has smaller individual pixels (pixel pitch of 4.16μm versus 4.28μm for the K-S2). Yet, the A1 is a much more recent model (by 5 years and 11 months) than the K-S2, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. 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 Sony A1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A1 for good quality output (200 dots per inch) amounts to 43.2 x 28.8 inches or 109.7 x 73.2 cm, for very good quality (250 dpi) 34.6 x 23 inches or 87.8 x 58.5 cm, and for excellent quality (300 dpi) 28.8 x 19.2 inches or 73.2 x 48.8 cm. The corresponding values for the Pentax K-S2 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 A1 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the K-S2, the A1 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-S2 has a native sensitivity range from ISO 100 to ISO 51200. The corresponding ISO settings for the Sony A1 are ISO 100 to ISO 32000, with the possibility to increase the ISO range to 500-102400.

K-S2 versus A1 MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). 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.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p...... ..
2.
 
Sony A1 Full Frame 49.8 8640 57608k/30p...... ..
3.
 
Pentax KP APS-C 24.1 6016 40001080/60i...... ..
4.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i...... ..
5.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.61106 80
6.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.01061 78
7.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.01120 79
8.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.41216 80
9.
 
Pentax K-30 APS-C 16.1 4928 32641080/30p23.713.01129 79
10.
 
Pentax K-5 APS-C 16.1 4928 32641080/25p23.714.11162 82
11.
 
Sony A7S III Full Frame 12.0 4240 28324K/120p23.713.92520 86
12.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.83344 99
13.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523 100
14.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.33517 92
15.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.93434 98
16.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.5701 79
17.
 
Sony A77 II APS-C 24.0 6000 40001080/60p...... ..

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the A1 provides a better video resolution than the K-S2. It can shoot movie footage at 8k/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 A1 has an electronic viewfinder (9437k dots), while the K-S2 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 A1 has a higher magnification than the one of the K-S2 (0.9x 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-S2 and Sony A1 in connection with corresponding information for a sample of similar cameras.

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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-S2optical n 3.0 921 swivel n 1/6000s 5.4 Y Y
2.
 
Sony A19437 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
3.
 
Pentax KPoptical n 3.0 921 tilting n 1/6000s 7.0 Y Y
4.
 
Pentax K-70optical n 3.0 921 swivel n 1/6000s 6.0 Y Y
5.
 
Pentax K-3 IIoptical Y 3.2 1037 fixed n 1/8000s 8.3 n Y
6.
 
Pentax K-S1optical n 3.0 921 fixed n 1/6000s 5.4 Y Y
7.
 
Pentax K-50optical n 3.0 921 fixed n 1/6000s 6.0 Y Y
8.
 
Pentax K-3optical Y 3.2 1037 fixed n 1/8000s 8.3 Y Y
9.
 
Pentax K-30optical n 3.0 921 fixed n 1/6000s 6.0 Y Y
10.
 
Pentax K-5optical Y 3.0 921 fixed n 1/8000s 7.0 Y Y
11.
 
Sony A7S III9440 n 3.0 1440 swivel Y 1/8000s 10.0 n 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 A7R II2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y
16.
 
Sony A681440 Y 2.7 460 tilting n 1/4000s 8.0 Y Y
17.
 
Sony A77 II2359 Y 3.0 1229 full-flex n 1/8000s 12.0 Y Y

One difference between the cameras concerns the presence of an on-board flash. The K-S2 has one, while the A1 does not. While the built-in flash of the K-S2 is not very powerful, it can at times be useful as a fill-in light.

The K-S2 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 A1 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 A1 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 Pentax K-S2 and the Sony A1 both have an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

The K-S2 writes its imaging data to SDXC cards, while the A1 uses CFexpress or SDXC cards. The A1 features dual card slots, which can be very useful in case a memory card fails. In contrast, the K-S2 only has one slot. The A1 supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the K-S2 can use UHS-I cards (up to 104 MB/s).

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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-S2 and Sony A1 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-S2YmonomonoY-micro2.0YY-
2.
 
Sony A1YstereomonoYYmini3.2Y-Y
3.
 
Pentax KPYstereomonoY--2.0Y--
4.
 
Pentax K-70YstereomonoY-mini2.0Y--
5.
 
Pentax K-3 IIYmonomonoYYmini3.0---
6.
 
Pentax K-S1Ystereomono--micro2.0---
7.
 
Pentax K-50Ymonomono--micro2.0---
8.
 
Pentax K-3YmonomonoYYmini3.0---
9.
 
Pentax K-30Ymonomono---2.0---
10.
 
Pentax K-5YstereomonoY-mini2.0---
11.
 
Sony A7S IIIYstereomonoYYfull3.2Y-Y
12.
 
Sony A7R IVYstereomonoYYmicro3.1YYY
13.
 
Sony A7R IIIYstereomonoYYmicro3.1YYY
14.
 
Sony A9YstereomonoYYmicro2.0YYY
15.
 
Sony A7R IIYstereomonoYYmicro2.0YY-
16.
 
Sony A68YstereomonoY-micro2.0---
17.
 
Sony A77 IIYstereomonoY-mini2.0YY-

It is notable that the A1 has a headphone jack, which makes it possible to attach external headphones and monitor the quality of sound during the recording process. The K-S2 lacks such a headphone port.

Studio photographers will appreciate that the Sony A1 (unlike the K-S2) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the K-S2 and the A1 are recent models that are part of the current product line-up. The K-S2 replaced the earlier Pentax K-S1, while the A1 does not have a direct predecessor. 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 conclusions can be drawn? Which of the two cameras – the Pentax K-S2 or the Sony A1 – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

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Reasons to prefer the Pentax K-S2:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • More compact: Is smaller (123x91mm vs 129x97mm) and thus needs less room in the bag.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • More affordable: Was introduced into a lower priced category (88 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in February 2015).

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Advantages of the Sony A1:

  • More detail: Has more megapixels (49.8 vs 20MP), which boosts linear resolution by 58%.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better image quality: Is equipped with a larger and more technologically advanced 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 (8k/30p vs 1080/30p).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • 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 (0.9x vs 0.63x).
  • More detailed LCD: Has a higher resolution rear screen (1440k vs 921k dots).
  • 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.
  • Longer lasting: Gets more shots (530 versus 410) out of a single battery charge.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • Faster data transfer: Supports a more advanced USB protocol (3.2 vs 2.0).
  • 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 11 months of technical progress since the K-S2 launch.

If the count of relative strengths (bullet points above) is taken as a measure, the A1 is the clear winner of the contest (25 : 8 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.

K-S2 08:25 A1

How about other alternatives? Do the specifications of the Pentax K-S2 and the Sony A1 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the K-S2 or the A1. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. 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.
 
Pentax K-S24.5/5....5/54.5/5 Feb 2015 749 i
2.
 
Sony A15/5o93/1004.5/55/5 Jan 2021 6,499 i
3.
 
Pentax KP4/5..82/1005/54.5/5 Jan 2017 1,099 i
4.
 
Pentax K-704.5/5..79/1004.5/54.5/5 Jun 2016 649 i
5.
 
Pentax K-3 II4.5/5....5/55/5 Apr 2015 1,099 i
6.
 
Pentax K-S14/5....4.5/54/5 Aug 2014 749 i
7.
 
Pentax K-505/5....5/54.5/5 Jun 2013 599 i
8.
 
Pentax K-34/5..83/1005/55/5 Oct 2013 1,299 i
9.
 
Pentax K-304/5..78/1004.5/54.5/5 May 2012 849 i
10.
 
Pentax K-54/5..83/1005/54.5/5 Sep 2010 1,099 i
11.
 
Sony A7S III..+ +91/1004.5/55/5 Jul 2020 3,499 i
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 3,199 i
14.
 
Sony A95/5+ +89/1005/55/5 Apr 2017 4,499 i
15.
 
Sony A7R II5/5+ +90/1005/55/5 Jun 2015 3,199 i
16.
 
Sony A683/5....4/54/5 Nov 2015 699 i
17.
 
Sony A77 II4/5..80/1004.5/55/5 May 2014 1,199 i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The ratings are only valid when referring to cameras in the same category and of the same age. 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. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Pentax K-S2:
Check Amazon price
Sony A1:
Check Amazon price

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. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Pentax K-S2 vs Sony A1

    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-S2 Sony A1
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax K mount lenses Sony E mount lenses
    Launch Date February 2015 January 2021
    Launch Price USD 749 USD 6,499
    Sensor Specs Pentax K-S2 Sony A1
    Sensor Technology CMOS BSI-CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.5 x 15.6 mm 35.9 x 24.0 mm
    Sensor Area 366.6 mm2 861.6 mm2
    Sensor Diagonal 28.2 mm 43.2 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 20 Megapixels 49.8 Megapixels
    Image Resolution 5472 x 3648 pixels 8640 x 5760 pixels
    Pixel Pitch 4.28 μm 4.16 μm
    Pixel Density 5.45 MP/cm2 5.78 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/30p Video 8k/30p Video
    ISO Setting 100 - 51,200 ISO 100 - 32,000 ISO
    ISO Boost no Enhancement 500 - 102,400 ISO
    Image Processor PRIME MII Dual BIONZ XR
    Screen Specs Pentax K-S2 Sony A1
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.9x
    Viewfinder Resolution 9437k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 921k dots 1440k dots
    LCD Attachment Swivel screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax K-S2 Sony A1
    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-Shutterup to 1/32000s
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Build-in Flash no On-Board Flash
    Storage Medium SDXC cards CFexpress or SDXC cards
    Second Storage Option Single card slot Dual card slots
    UHS card support UHS-I UHS-II
    Connectivity Specs Pentax K-S2 Sony A1
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.2
    HDMI Port micro HDMI mini HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Near-Field Communication NFC built-in no NFC
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Pentax K-S2 Sony A1
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type D-LI109 NP-FZ100
    Battery Life (CIPA)410 shots per charge530 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 123 x 91 x 73 mm
    (4.8 x 3.6 x 2.9 in)
    129 x 97 x 81 mm
    (5.1 x 3.8 x 3.2 in)
    Camera Weight 678 g (23.9 oz) 737 g (26.0 oz)

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