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Pentax K-S1 vs KP

The Pentax K-S1 and the Pentax KP are two digital cameras that were officially introduced, respectively, in August 2014 and January 2017. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The K-S1 has a resolution of 20 megapixels, whereas the KP provides 24.1 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
Pentax KP
Pentax K-S1   Pentax KP
Digital single lens reflex Digital single lens reflex
Pentax K mount lenses Pentax K mount lenses
20 MP – APS-C sensor 24.1 MP – APS-C sensor
1080/30p Video 1080/60i Video
ISO 100-51,200 ISO 100-819,200
Optical viewfinder Optical viewfinder
3.0" LCD – 921k dots 3.0" LCD – 921k dots
Fixed screen (not touch-sensitive) Tilting screen (no touchscreen)
5.4 shutter flaps per second 7 shutter flaps per second
In-body stabilizationIn-body stabilization
not weather sealedWeathersealed body
410 shots per battery charge390 shots per battery charge
121 x 93 x 70 mm, 558 g 132 x 101 x 76 mm, 703 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-S1 and the Pentax KP? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

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Body comparison

An illustration of the physical size and weight of the Pentax K-S1 and the Pentax KP is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. 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 KP is available in two color-versions (black, silver).

Size Pentax K-S1 vs Pentax KP
Compare K-S1 versus KP top
Comparison K-S1 or KP rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax KP is notably larger (18 percent) than the Pentax K-S1. Moreover, the KP is markedly heavier (26 percent) than the K-S1. It is noteworthy in this context that the KP 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.

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
# image 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.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 1,099ebay.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-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 649ebay.com
6.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749ebay.com
7.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099ebay.com
8.
 
Pentax K-50 130 mm 97 mm 71 mm 650 g 410 Y Jun 2013 599ebay.com
9.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 549ebay.com
10.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
11.
 
Pentax K-30 130 mm 97 mm 71 mm 650 g 410 Y May 2012 849ebay.com
12.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 1,099ebay.com
13.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699ebay.com
14.
 
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.
padding

The price is, of course, an important factor in any camera decision. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The K-S1 was launched at a markedly lower price (by 32 percent) than the KP, 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.5. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Technology-wise, the KP 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-S1 and Pentax KP sensor measures

While the two cameras under review share the same sensor size, the KP offers a higher resolution of 24.1 megapixels, compared with 20 MP of the K-S1. This megapixels advantage translates into a 10 percent gain in linear resolution. On the other hand, these sensor specs imply that the KP has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.90μm versus 4.28μm for the K-S1). However, it should be noted that the KP is much more recent (by 2 years and 4 months) than the K-S1, and its sensor will have benefitted from technological advances during this time that compensate for the smaller pixel size. 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 KP implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the KP for good quality output (200 dots per inch) amounts to 30.1 x 20 inches or 76.4 x 50.8 cm, for very good quality (250 dpi) 24.1 x 16 inches or 61.1 x 40.6 cm, and for excellent quality (300 dpi) 20.1 x 13.3 inches or 50.9 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.

Unlike the K-S1, the KP 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-S1 has a native sensitivity range from ISO 100 to ISO 51200. The corresponding ISO settings for the Pentax KP are ISO 100 to ISO 819200 (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-S1 versus KP 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 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
# image 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.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
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-70 APS-C 24.0 6000 40001080/60i23.813.1163980
6.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p23.612.9151479
7.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
8.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.0112079
9.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
10.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
11.
 
Pentax K-30 APS-C 16.1 4928 32641080/30p23.713.0112979
12.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
13.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
14.
 
Sony A58 APS-C 19.8 5456 36321080/60i23.312.575374
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras cannot only take still pictures, but also record videos. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the KP provides a faster frame rate than the K-S1. It can shoot movie 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 range of features. The K-S1 and the KP 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%), as well as the same magnification (0.63x). The adjacent table lists some of the other core features of the Pentax K-S1 and Pentax KP along with similar information for a selection of comparators.

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Core Features
# image 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.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y 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-70optical n3.0 / 921 swivel n 1/6000s 6.0/s Y Y
6.
 
Pentax K-S2optical n3.0 / 921 swivel n 1/6000s 5.4/s Y Y
7.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
8.
 
Pentax K-50optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
9.
 
Pentax K-500optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
10.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
11.
 
Pentax K-30optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
12.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
13.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
14.
 
Sony A581440 n2.7 / 460 tilting n 1/4000s 5.0/s Y Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
padding

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 KP 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 KP 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-S1 and the KP write their files to SDXC cards. 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-S1 and Pentax KP and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
# image 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.
 
Pentax KPYstereo / monoY--2.0Y--
3.
 
Nikon D5500Ystereo / monoY-mini2.0Y--
4.
 
Nikon D5300Ystereo / monoY-mini2.0Y--
5.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
6.
 
Pentax K-S2Ymono / monoY-micro2.0YY-
7.
 
Pentax K-3 IIYmono / monoYYmini3.0---
8.
 
Pentax K-50Ymono / mono--micro2.0---
9.
 
Pentax K-500Ymono / mono---2.0---
10.
 
Pentax K-3Ymono / monoYYmini3.0---
11.
 
Pentax K-30Ymono / mono---2.0---
12.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
13.
 
Sony A68Ystereo / monoY-micro2.0---
14.
 
Sony A58Ystereo / monoY-mini2.0---
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It is notable that the KP 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.

Both the K-S1 and the KP have been discontinued, but can regularly be found used on ebay. The K-S1 was replaced by the Pentax K-S2, while the KP does not have a direct successor. Further information on the features and operation of the K-S1 and KP can be found, respectively, in the Pentax K-S1 Manual (free pdf) or the online Pentax KP Manual.

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Review summary

So what is the bottom line? Which of the two cameras – the Pentax K-S1 or the Pentax KP – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.


Advantages of the Pentax K-S1:

  • More compact: Is smaller (121x93mm vs 132x101mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 145g or 21 percent) and hence easier to carry around.
  • More affordable: Was introduced into a lower priced category (32 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in August 2014).


Arguments in favor of the Pentax KP:

  • More detail: Has more megapixels (24.1 vs 20MP), which boosts linear resolution by 10%.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • 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.
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Faster burst: Shoots at higher frequency (7 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.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • More modern: Reflects 2 years and 4 months of technical progress since the K-S1 launch.

If the count of relative strengths (bullet points above) is taken as a measure, the KP is the clear winner of the contest (12 : 4 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

K-S1 04:12 KP

How about other alternatives? Do the specifications of the Pentax K-S1 and the Pentax KP 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-S1 or the KP. 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 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
# image  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.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 1,099ebay.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-704.5/5..4/579/1004.5/54.5/5 Jun 2016 649ebay.com
6.
 
Pentax K-S24.5/5......5/54.5/5 Feb 2015 749ebay.com
7.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 1,099ebay.com
8.
 
Pentax K-505/5......5/54.5/5 Jun 2013 599ebay.com
9.
 
Pentax K-500........4.5/54.5/5 Jun 2013 549ebay.com
10.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
11.
 
Pentax K-304/5....78/1004.5/54.5/5 May 2012 849ebay.com
12.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 1,099ebay.com
13.
 
Sony A683/5......4/54/5 Nov 2015 699ebay.com
14.
 
Sony A583/5......4.5/54.5/5 Feb 2013 599ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Pentax K-S1 vs Pentax KP

    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 Pentax KP
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Pentax K mount lenses Pentax K mount lenses
    Launch Date August 2014 January 2017
    Launch Price USD 749 USD 1,099
    Sensor Specs Pentax K-S1 Pentax KP
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 23.5 x 15.6 mm 23.5 x 15.6 mm
    Sensor Area 366.6 mm2 366.6 mm2
    Sensor Diagonal 28.2 mm 28.2 mm
    Crop Factor 1.5x 1.5x
    Sensor Resolution 20 Megapixels 24.1 Megapixels
    Image Resolution 5472 x 3648 pixels 6016 x 4000 pixels
    Pixel Pitch 4.28 μm 3.90 μm
    Pixel Density 5.45 MP/cm2 6.56 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/30p Video 1080/60i Video
    ISO Setting 100 - 51,200 ISO 100 - 819,200 ISO
    Image Processor PRIME MII PRIME IV
    DXO Sensor Quality (score) 78 ..
    DXO Color Depth (bits) 23.5 ..
    DXO Dynamic Range (EV) 13.0 ..
    DXO Low Light (ISO) 1061 ..
    Screen Specs Pentax K-S1 Pentax KP
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.63x
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 921k dots 921k dots
    LCD Attachment Fixed screen Tilting screen
    Shooting Specs Pentax K-S1 Pentax KP
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/6000s 1/6000s
    Continuous Shooting 5.4 shutter flaps/s 7 shutter flaps/s
    Electronic Shutterno E-Shutterup to 1/24000s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Pentax K-S1 Pentax KP
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port micro HDMI no HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi Wifi built-in
    Body Specs Pentax K-S1 Pentax KP
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Pentax D-LI109 Pentax D-LI109
    Battery Life (CIPA)410 shots per charge390 shots per charge
    Body Dimensions 121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    132 x 101 x 76 mm
    (5.2 x 4.0 x 3.0 in)
    Camera Weight 558 g (19.7 oz) 703 g (24.8 oz)
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