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Pentax K-1 vs K-S1

The Pentax K-1 and the Pentax K-S1 are two digital cameras that were officially introduced, respectively, in February 2016 and August 2014. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a full frame (K-1) and an APS-C (K-S1) sensor. The K-1 has a resolution of 36.2 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-1
versus
Pentax K-S1
Pentax K-1   Pentax K-S1
Digital single lens reflex Digital single lens reflex
Pentax K mount lenses Pentax K mount lenses
36.2 MP – Full Frame sensor 20 MP – APS-C sensor
1080/60i Video 1080/30p Video
ISO 100-204,800 ISO 100-51,200
Optical viewfinder Optical viewfinder
3.2" LCD – 1037k dots 3.0" LCD – 921k dots
Fully flexible screen (no touchscreen) Fixed screen (not touch-sensitive)
4.4 shutter flaps per second 5.4 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodynot weather sealed
760 shots per battery charge410 shots per battery charge
137 x 110 x 86 mm, 1010 g 121 x 93 x 70 mm, 558 g
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Check K-1 offers at
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Check K-S1 offers at
ebay.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-1 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

The physical size and weight of the Pentax K-1 and the Pentax K-S1 are illustrated 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 size dimensions are rounded to the nearest millimeter.

The K-1 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-1 vs Pentax K-S1
Compare K-1 versus K-S1 top
Comparison K-1 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 (25 percent) than the Pentax K-1. Moreover, the K-S1 is substantially lighter (45 percent) than the K-1. It is worth mentioning in this context that the K-1 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-1 gets 760 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 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
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax K-1 137 mm 110 mm 86 mm 1010 g 760 Y Feb 2016 US$ 1 799ebay.com
2.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 US$ 749ebay.com
3.
 
Canon 5D Mark IV 151 mm 116 mm 76 mm 890 g 900 Y Aug 2016 US$ 3 499 amazon.com
4.
 
Nikon D500 147 mm 115 mm 81 mm 860 g 1240 Y Jan 2016 US$ 1 999ebay.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.
 
Olympus E-M1 II 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 US$ 1 999ebay.com
8.
 
Pentax K-1 II 137 mm 110 mm 86 mm 1010 g 670 Y Feb 2018 US$ 1 999 amazon.com
9.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 US$ 1 099ebay.com
10.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 US$ 549ebay.com
11.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 US$ 749ebay.com
12.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 US$ 3 199ebay.com
13.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 US$ 3 199ebay.com
14.
 
Sony A7R IIIA 127 mm 96 mm 74 mm 650 g 650 Y Apr 2021 US$ 3 199 amazon.com
15.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 US$ 699ebay.com
16.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 US$ 3 199ebay.com
17.
 
Sony A850 156 mm 117 mm 82 mm 895 g 880 Y Aug 2009 US$ 1 999ebay.com
Note: 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 58 percent) than the K-1, 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 tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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 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-1 features a full frame sensor and the Pentax K-S1 an APS-C sensor. The sensor area in the K-S1 is 57 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 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-1 uses a more advanced image processing engine (PRIME IV) than the K-S1 (PRIME MII), with benefits for noise reduction, color accuracy, and processing speed.

Pentax K-1 and Pentax K-S1 sensor measures

With 36.2MP, the K-1 offers a higher resolution than the K-S1 (20MP), but the K-1 nevertheless has larger individual pixels (pixel pitch of 4.88μm versus 4.28μm for the K-S1) due to its larger sensor. Moreover, the K-1 is a somewhat more recent model (by 1 year and 5 months) than the K-S1, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. 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-1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-1 for good quality output (200 dots per inch) amounts to 36.8 x 24.6 inches or 93.5 x 62.4 cm, for very good quality (250 dpi) 29.4 x 19.6 inches or 74.8 x 49.9 cm, and for excellent quality (300 dpi) 24.5 x 16.4 inches or 62.3 x 41.6 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.

Unlike the K-S1, the K-1 has the capacity to capture high quality composite images 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-1 has a native sensitivity range from ISO 100 to ISO 204800. 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-1 versus K-S1 MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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"). Of the two cameras under review, the K-1 provides substantially higher image quality than the K-S1, with an overall score that is 18 points higher. This advantage is based on 1.9 bits higher color depth, 1.6 EV in additional dynamic range, and 1.6 stops in additional low light sensitivity. 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-1 Full Frame 36.2 7360 49121080/60i25.414.6328096
2.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.0106178
3.
 
Canon 5D Mark IV Full Frame 30.1 6720 44804K/30p24.813.6299591
4.
 
Nikon D500 APS-C 20.7 5568 37124K/30p24.014.0132483
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.
 
Olympus E-M1 II Four Thirds 20.2 5184 38884K/30p23.712.8131280
8.
 
Pentax K-1 II Full Frame 36.2 7360 49121080/60i25.114.0269893
9.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
10.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
11.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p23.612.9151479
12.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
13.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
14.
 
Sony A7R IIIA Full Frame 42.2 7952 53044K/30p26.014.73523100
15.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
16.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
17.
 
Sony A850 Full Frame 24.4 6048 4032none23.812.2141579
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the K-1 provides a higher frame rate than the K-S1. It can shoot video footage at 1080/60i, 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 variety of features. The K-1 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-1 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-1 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-1optical Y3.2 / 1037 full-flex n 1/8000s 4.4/s n Y
2.
 
Pentax K-S1optical n3.0 / 921 fixed n 1/6000s 5.4/s Y Y
3.
 
Canon 5D Mark IVoptical Y3.2 / 1620 fixed Y 1/8000s 7.0/s n n
4.
 
Nikon D500optical Y3.2 / 2359 tilting Y 1/8000s 10.0/s n n
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.
 
Olympus E-M1 II2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
8.
 
Pentax K-1 IIoptical Y3.2 / 1037 full-flex n 1/8000s 4.4/s n Y
9.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
10.
 
Pentax K-500optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
11.
 
Pentax K-S2optical n3.0 / 921 swivel n 1/6000s 5.4/s Y Y
12.
 
Sony A7R II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
13.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
14.
 
Sony A7R IIIA3686 n3.0 / 2340 tilting Y 1/8000s 10.0/s n Y
15.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
16.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0/s n Y
17.
 
Sony A850optical Y3.0 / 922 fixed n 1/8000s 3.0/s n Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the K-1, 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-1 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-1 and the K-S1 write their files to SDXC cards. The K-1 features dual card slots, which can be very useful in case a memory card fails. In contrast, the K-S1 only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of 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-1 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-1Ystereo / monoYYmicro2.0Y--
2.
 
Pentax K-S1Ystereo / mono--micro2.0---
3.
 
Canon 5D Mark IVYmono / monoYYmini3.0YY-
4.
 
Nikon D500Ystereo / monoYYmini3.0YYY
5.
 
Nikon D5300Ystereo / monoY-mini2.0Y--
6.
 
Nikon D5500Ystereo / monoY-mini2.0Y--
7.
 
Olympus E-M1 IIYstereo / monoYYmicro3.0Y--
8.
 
Pentax K-1 IIYstereo / monoYYmicro2.0Y--
9.
 
Pentax K-3 IIYmono / monoYYmini3.0---
10.
 
Pentax K-500Ymono / mono---2.0---
11.
 
Pentax K-S2Ymono / monoY-micro2.0YY-
12.
 
Sony A7R IIYstereo / monoYYmicro2.0YY-
13.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
14.
 
Sony A7R IIIAYstereo / monoYYmicro3.2YYY
15.
 
Sony A68Ystereo / monoY-micro2.0---
16.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
17.
 
Sony A850Y- / ---mini2.0---

It is notable that the K-1 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-1 (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-1 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the K-1 and the K-S1 have been discontinued, but can regularly be found used on ebay. The K-S1 was replaced by the Pentax K-S2, while the K-1 was followed by the Pentax K-1 II. Further information on the features and operation of the K-1 and K-S1 can be found, respectively, in the Pentax K-1 Manual (free pdf) or the online Pentax K-S1 Manual.

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Review summary

So how do things add up? Is the Pentax K-1 better than the Pentax K-S1 or vice versa? A synthesis of the relative strong points of each of the models is listed below.


Reasons to prefer the Pentax K-1:

  • More detail: Offers more megapixels (36.2 vs 20MP) with a 35% higher linear resolution.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better image quality: Scores substantially higher (18 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (1.9 bits more color depth).
  • More dynamic range: Captures a larger spectrum of light and dark details (1.6 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (1.6 stops ISO advantage).
  • Better jpgs: Has a more modern image processing engine (PRIME IV vs PRIME MII).
  • Better video: Provides higher movie framerates (1080/60i versus 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 (1037k vs 921k dots).
  • More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/6000s) to freeze action.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Can take more shots (760 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.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • 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.
  • More modern: Is somewhat more recent (announced 1 year and 5 months after the K-S1).


Advantages of the Pentax K-S1:

  • Faster burst: Shoots at higher frequency (5.4 vs 4.4 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (121x93mm vs 137x110mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 452g or 45 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 (58 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in August 2014).

If the number of relative strengths (bullet points above) is taken as a guide, the K-1 is the clear winner of the match-up (24 : 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-1 24:06 K-S1

How about other alternatives? Do the specifications of the Pentax K-1 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 the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the K-1 or the K-S1. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is why expert reviews 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-15/5....84/1005/55/5 Feb 2016 US$ 1 799ebay.com
2.
 
Pentax K-S14/5......4.5/54/5 Aug 2014 US$ 749ebay.com
3.
 
Canon 5D Mark IV4.5/5+ +4/587/1004.5/54.5/5 Aug 2016 US$ 3 499 amazon.com
4.
 
Nikon D5005/5+ +4.7/591/1004.5/55/5 Jan 2016 US$ 1 999ebay.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.
 
Olympus E-M1 II5/5+ +5/585/1004.5/54.5/5 Sep 2016 US$ 1 999ebay.com
8.
 
Pentax K-1 II....4.5/579/1004.5/54.5/5 Feb 2018 US$ 1 999 amazon.com
9.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 US$ 1 099ebay.com
10.
 
Pentax K-500........4.5/54.5/5 Jun 2013 US$ 549ebay.com
11.
 
Pentax K-S24.5/5......5/54.5/5 Feb 2015 US$ 749ebay.com
12.
 
Sony A7R II5/5+ +5/590/1005/55/5 Jun 2015 US$ 3 199ebay.com
13.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 US$ 3 199ebay.com
14.
 
Sony A7R IIIA..+ +4/590/1004.5/55/5 Apr 2021 US$ 3 199 amazon.com
15.
 
Sony A683/5......4/54/5 Nov 2015 US$ 699ebay.com
16.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 US$ 3 199ebay.com
17.
 
Sony A8503/5....75/100..4.5/5 Aug 2009 US$ 1 999ebay.com
Note: (+ +) 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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. 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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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-1 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-1 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 February 2016 August 2014
    Launch Price USD 1,799 USD 749
    Sensor Specs Pentax K-1 Pentax K-S1
    Sensor Technology CMOS CMOS
    Sensor Format Full Frame Sensor APS-C Sensor
    Sensor Size 35.9 x 24.0 mm 23.5 x 15.6 mm
    Sensor Area 861.6 mm2 366.6 mm2
    Sensor Diagonal 43.2 mm 28.2 mm
    Crop Factor 1.0x 1.5x
    Sensor Resolution 36.2 Megapixels 20 Megapixels
    Image Resolution 7360 x 4912 pixels 5472 x 3648 pixels
    Pixel Pitch 4.88 μm 4.28 μm
    Pixel Density 4.20 MP/cm2 5.45 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60i Video 1080/30p Video
    ISO Setting 100 - 204,800 ISO 100 - 51,200 ISO
    Image Processor PRIME IV PRIME MII
    DXO Sensor Quality (score) 96 78
    DXO Color Depth (bits) 25.4 23.5
    DXO Dynamic Range (EV) 14.6 13.0
    DXO Low Light (ISO) 3280 1061
    Screen Specs Pentax K-1 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 1037k dots 921k dots
    LCD Attachment Fully flexible screen Fixed screen
    Shooting Specs Pentax K-1 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 4.4 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 UHS-I UHS-I
    Connectivity Specs Pentax K-1 Pentax K-S1
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 2.0 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
    Geotagging GPS built-in no internal GPS
    Body Specs Pentax K-1 Pentax K-S1
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type Pentax D-LI90 Pentax D-LI109
    Battery Life (CIPA)760 shots per charge410 shots per charge
    Body Dimensions 137 x 110 x 86 mm
    (5.4 x 4.3 x 3.4 in)
    121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    Camera Weight 1010 g (35.6 oz) 558 g (19.7 oz)
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    Check K-1 offers at
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    Check K-S1 offers at
    ebay.com

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