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Pentax K-S1 vs Sony A7 IV

The Pentax K-S1 and the Sony Alpha A7 IV are two digital cameras that were officially introduced, respectively, in August 2014 and October 2021. The K-S1 is a DSLR, while the A7 IV is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (K-S1) and a full frame (A7 IV) sensor. The Pentax has a resolution of 20 megapixels, whereas the Sony provides 32.7 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 IV
Pentax K-S1   Sony A7 IV
Digital single lens reflex Mirrorless system camera
Pentax K mount lenses Sony E mount lenses
20 MP – APS-C sensor 32.7 MP – Full Frame sensor
1080/30p Video 4K/60p Video
ISO 100-51,200 ISO 100-51,200 (50 - 204,800)
Optical viewfinder Electronic viewfinder (3686k dots)
3.0" LCD – 921k dots 3.0" LCD – 1037k dots
Fixed screen (not touch-sensitive) Swivel 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 charge580 shots per battery charge
121 x 93 x 70 mm, 558 g 131 x 96 x 80 mm, 659 g
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Check K-S1 offers at
ebay.com
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Check A7 IV price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-S1 and the Sony Alpha A7 IV? 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 Pentax K-S1 and the Sony A7 IV. 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 IV is only available in black.

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

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7 IV is notably larger (12 percent) than the Pentax K-S1. Moreover, the A7 IV is markedly heavier (18 percent) than the K-S1. It is noteworthy in this context that the A7 IV 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 IV can take 580 images on a single charge of its NP-FZ100 power pack. The power pack in the A7 IV can be charged via the USB port, which can be very convenient when travelling.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 749ebay.com
2.
 
Sony A7 IV 131 mm 96 mm 80 mm 659 g 580 Y Oct 2021 2,499 amazon.com
3.
 
Nikon D5500 124 mm 97 mm 70 mm 470 g 820 n Jan 2015 899ebay.com
4.
 
Nikon D5300 125 mm 98 mm 76 mm 480 g 600 n Oct 2013 799ebay.com
5.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749ebay.com
6.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099ebay.com
7.
 
Pentax K-50 130 mm 97 mm 71 mm 650 g 410 Y Jun 2013 599ebay.com
8.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 549ebay.com
9.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
10.
 
Pentax K-30 130 mm 97 mm 71 mm 650 g 410 Y May 2012 849ebay.com
11.
 
Sony A9 II 129 mm 96 mm 76 mm 678 g 690 Y Oct 2019 4,499 amazon.com
12.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499 amazon.com
13.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 amazon.com
14.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199ebay.com
15.
 
Sony A7S II 127 mm 96 mm 60 mm 627 g 370 Y Sep 2015 2,999ebay.com
16.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699ebay.com
17.
 
Sony A58 129 mm 95 mm 78 mm 492 g 690 n Feb 2013 599ebay.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 70 percent) than the A7 IV, 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.

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. 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 are more costly to manufacture and tend to 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 IV a full frame sensor. The sensor area in the A7 IV is 134 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 IV sensor measures

With 32.7MP, the A7 IV offers a higher resolution than the K-S1 (20MP), but the A7 IV nevertheless has larger individual pixels (pixel pitch of 5.12μm versus 4.28μm for the K-S1) due to its larger sensor. Moreover, the A7 IV is a much more recent model (by 7 years and 1 month) 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 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 A7 IV implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7 IV for good quality output (200 dots per inch) amounts to 35 x 23.4 inches or 89 x 59.3 cm, for very good quality (250 dpi) 28 x 18.7 inches or 71.2 x 47.5 cm, and for excellent quality (300 dpi) 23.4 x 15.6 inches or 59.3 x 39.6 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 IV 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 IV are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.

In terms of underlying technology, the K-S1 is build around a CMOS sensor, while the A7 IV uses a BSI-CMOS imager. 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-S1 versus A7 IV 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"). Of the two cameras under consideration, the A7 IV offers substantially better image quality than the K-S1 (overall score 19 points higher). The advantage is based on 1.9 bits higher color depth, 1.7 EV in additional dynamic range, and 1.7 stops in additional low light sensitivity. 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.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.0106178
2.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
3.
 
Nikon D5500 APS-C 24.0 6000 40001080/60p24.114.0143884
4.
 
Nikon D5300 APS-C 24.0 6000 40001080/60p24.013.9133883
5.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p23.612.9151479
6.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
7.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.0112079
8.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
9.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
10.
 
Pentax K-30 APS-C 16.1 4928 32641080/30p23.713.0112979
11.
 
Sony A9 II Full Frame 24.0 6000 40004K/30p25.014.0343493
12.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.8334499
13.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.7373096
14.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
15.
 
Sony A7S II Full Frame 12.0 4240 28324K/30p23.613.3299385
16.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
17.
 
Sony A58 APS-C 19.8 5456 36321080/60i23.312.575374
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 also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A7 IV provides a better video resolution than the K-S1. It can shoot movie footage at 4K/60p, while the Pentax is limited to 1080/30p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the A7 IV has an electronic viewfinder (3686k 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 IV 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 following table reports on some other key feature differences and similarities of the Pentax K-S1, the Sony A7 IV, and comparable cameras.

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Core Features
    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-S1optical n3.0 / 921 fixed n 1/6000s 5.4/s Y Y
2.
 
Sony A7 IV3686 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
3.
 
Nikon D5500optical n3.2 / 1037 swivel Y 1/4000s 5.0/s Y n
4.
 
Nikon D5300optical n3.2 / 1037 swivel n 1/4000s 5.0/s Y n
5.
 
Pentax K-S2optical n3.0 / 921 swivel n 1/6000s 5.4/s Y Y
6.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
7.
 
Pentax K-50optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
8.
 
Pentax K-500optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
9.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
10.
 
Pentax K-30optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
11.
 
Sony A9 II3686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
12.
 
Sony A7R IV5760 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
13.
 
Sony A7 III2359 n3.0 / 922 tilting Y 1/8000s 10.0/s n Y
14.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
15.
 
Sony A7S II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
16.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
17.
 
Sony A581440 n2.7 / 460 tilting n 1/4000s 5.0/s Y Y
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The K-S1 has one, while the A7 IV 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 A7 IV has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking 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 A7 IV 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 K-S1 writes its imaging data to SDXC cards, while the A7 IV uses CFexpress (type A) or SDXC cards. The A7 IV 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 IV supports UHS-II cards (on both slots), while the K-S1 can use UHS-I cards.

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 IV 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
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax K-S1Ystereo / mono--micro2.0---
2.
 
Sony A7 IVYstereo / monoYYfull3.2Y-Y
3.
 
Nikon D5500Ystereo / monoY-mini2.0Y--
4.
 
Nikon D5300Ystereo / monoY-mini2.0Y--
5.
 
Pentax K-S2Ymono / monoY-micro2.0YY-
6.
 
Pentax K-3 IIYmono / monoYYmini3.0---
7.
 
Pentax K-50Ymono / mono--micro2.0---
8.
 
Pentax K-500Ymono / mono---2.0---
9.
 
Pentax K-3Ymono / monoYYmini3.0---
10.
 
Pentax K-30Ymono / mono---2.0---
11.
 
Sony A9 IIYstereo / monoYYmicro3.1YYY
12.
 
Sony A7R IVYstereo / monoYYmicro3.1YYY
13.
 
Sony A7 IIIYstereo / monoYYmicro3.1YYY
14.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
15.
 
Sony A7S IIYstereo / monoYYmicro2.0YY-
16.
 
Sony A68Ystereo / monoY-micro2.0---
17.
 
Sony A58Ystereo / monoY-mini2.0---

It is notable that the A7 IV 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 IV 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 features and operation of the K-S1 and A7 IV can be found, respectively, in the Pentax K-S1 Manual (free pdf) or the online Sony A7 IV Manual.

Review summary

So what conclusions can be drawn? Which of the two cameras – the Pentax K-S1 or the Sony A7 IV – 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-S1:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • More compact: Is smaller (121x93mm vs 131x96mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 101g or 15 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 (70 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 IV:

  • More detail: Has more megapixels (32.7 vs 20MP), which boosts linear resolution by 28%.
  • Better image quality: Scores substantially higher (19 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.9 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 (1.7 stops ISO advantage).
  • 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.
  • 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 detailed LCD: Has a higher resolution rear screen (1037k vs 921k dots).
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • 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 (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 (580 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 (3.2 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.
  • 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 7 years and 1 month of technical progress since the K-S1 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the A7 IV is the clear winner of the contest (29 : 6 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 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-S1 06:29 A7 IV

How about other alternatives? Do the specifications of the Pentax K-S1 and the Sony A7 IV 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 remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the K-S1 or the A7 IV. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why expert reviews are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], 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
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 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 749ebay.com
2.
 
Sony A7 IV5/5+ +4.5/589/1004.5/54.5/5 Oct 2021 2,499 amazon.com
3.
 
Nikon D55005/5+..79/1004.5/54.5/5 Jan 2015 899ebay.com
4.
 
Nikon D53004/5+ +..79/1004.5/54.5/5 Oct 2013 799ebay.com
5.
 
Pentax K-S24.5/5......5/54.5/5 Feb 2015 749ebay.com
6.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 1,099ebay.com
7.
 
Pentax K-505/5......5/54.5/5 Jun 2013 599ebay.com
8.
 
Pentax K-500........4.5/54.5/5 Jun 2013 549ebay.com
9.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
10.
 
Pentax K-304/5....78/1004.5/54.5/5 May 2012 849ebay.com
11.
 
Sony A9 II....5/590/1005/55/5 Oct 2019 4,499 amazon.com
12.
 
Sony A7R IV5/5+4.5/591/1004.5/55/5 Jul 2019 3,499 amazon.com
13.
 
Sony A7 III..+ +4.5/589/1005/55/5 Feb 2018 1,999 amazon.com
14.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 3,199ebay.com
15.
 
Sony A7S II5/5+....4.5/55/5 Sep 2015 2,999ebay.com
16.
 
Sony A683/5......4/54/5 Nov 2015 699ebay.com
17.
 
Sony A583/5......4.5/54.5/5 Feb 2013 599ebay.com
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. 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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Check K-S1 offers at
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Check A7 IV price at
amazon.com

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-S1 vs Sony A7 IV

    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 IV
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax K mount lenses Sony E mount lenses
    Launch Date August 2014 October 2021
    Launch Price USD 749 USD 2,499
    Sensor Specs Pentax K-S1 Sony A7 IV
    Sensor Technology CMOS BSI-CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.5 x 15.6 mm 35.9 x 23.9 mm
    Sensor Area 366.6 mm2 858.01 mm2
    Sensor Diagonal 28.2 mm 43.1 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 20 Megapixels 32.7 Megapixels
    Image Resolution 5472 x 3648 pixels 7008 x 4672 pixels
    Pixel Pitch 4.28 μm 5.12 μm
    Pixel Density 5.45 MP/cm2 3.82 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/30p Video 4K/60p Video
    ISO Setting 100 - 51,200 ISO 100 - 51,200 ISO
    ISO Boost no Enhancement 50 - 204,800 ISO
    Image Processor PRIME MII BIONZ XR
    DXO Sensor Quality (score) 78 97
    DXO Color Depth (bits) 23.5 25.4
    DXO Dynamic Range (EV) 13.0 14.7
    DXO Low Light (ISO) 1061 3379
    Screen Specs Pentax K-S1 Sony A7 IV
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.78x
    Viewfinder Resolution 3686k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 921k dots 1037k dots
    LCD Attachment Fixed screen Swivel screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax K-S1 Sony A7 IV
    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
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDXC cards CFexA or SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-I Dual UHS-II
    Connectivity Specs Pentax K-S1 Sony A7 IV
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 3.2
    HDMI Port micro HDMI full HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support no Wifi Wifi built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Pentax K-S1 Sony A7 IV
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type D-LI109 NP-FZ100
    Battery Life (CIPA)410 shots per charge580 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)
    131 x 96 x 80 mm
    (5.2 x 3.8 x 3.1 in)
    Camera Weight 558 g (19.7 oz) 659 g (23.2 oz)
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