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Pentax K-S1 vs Sony A58

The Pentax K-S1 and the Sony Alpha SLT-A58 are two digital cameras that were officially introduced, respectively, in August 2014 and February 2013. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The Pentax has a resolution of 20 megapixels, whereas the Sony provides 19.8 MP.

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

Headline Specifications
Pentax K-S1
versus
Sony A58
Pentax K-S1   Sony A58
Digital single lens reflex Digital single lens reflex
Pentax K mount lenses Sony A mount lenses
20 MP – APS-C sensor 19.8 MP – APS-C sensor
1080/30p Video 1080/60i Video
ISO 100-51,200 ISO 100-16,000 (100 - 25,600)
Optical viewfinder Electronic viewfinder (1440k dots)
3.0" LCD – 921k dots 2.7" LCD – 460k dots
Fixed screen (not touch-sensitive) Tilting screen (no touchscreen)
5.4 shutter flaps per second 5 shutter flaps per second
In-body stabilizationIn-body stabilization
410 shots per battery charge690 shots per battery charge
121 x 93 x 70 mm, 558 g 129 x 95 x 78 mm, 492 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 Sony Alpha SLT-A58? 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 side-by-side display below illustrates the physical size and weight of the Pentax K-S1 and the Sony A58. 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 A58 is only available in black.

Size Pentax K-S1 vs Sony A58
Compare K-S1 versus A58 top
Comparison K-S1 or A58 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A58 is notably larger (9 percent) than the Pentax K-S1. However, the A58 is markedly lighter (12 percent) than the K-S1. In this context, it is worth noting that neither the K-S1 nor the A58 are weather-sealed.

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 Pentax D-LI109 battery, while the A58 can take 690 images on a single charge of its Sony NP-FM500H power pack.

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.
 
Sony A58 129 mm 95 mm 78 mm 492 g 690 n Feb 2013 599ebay.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.
 
Nikon D3200 125 mm 96 mm 77 mm 505 g 540 n Apr 2012 599ebay.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.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699ebay.com
13.
 
Sony A77 II 143 mm 104 mm 81 mm 647 g 480 Y May 2014 1,199ebay.com
14.
 
Sony A5100 110 mm 63 mm 36 mm 283 g 400 n Aug 2014 549ebay.com
15.
 
Sony A6000 120 mm 67 mm 45 mm 344 g 360 n Feb 2014 599ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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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 A58 was launched at a somewhat lower price (by 20 percent) than the K-S1, which makes it more attractive for photographers on a tight budget. 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.

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.

Pentax K-S1 and Sony A58 sensor measures

While the two cameras under review share the same sensor size, the K-S1 offers a slightly higher resolution of 20 megapixels, compared with 19.8 MP of the A58. This megapixels advantage translates into a 0.3 percent gain in linear resolution. On the other hand, these sensor specs imply that the K-S1 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 4.28μm versus 4.31μm for the A58). In this context, it should be noted, however, that the K-S1 is a somewhat more recent model (by 1 year and 6 months) than the A58, and its sensor might have benefitted from technological advances during this time that at least partly compensate for the smaller pixel size. Coming back to sensor resolution, it should be mentioned that the K-S1 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The Pentax K-S1 has a native sensitivity range from ISO 100 to ISO 51200. The corresponding ISO settings for the Sony Alpha SLT-A58 are ISO 100 to ISO 16000, with the possibility to increase the ISO range to 100-25600.

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 A58 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 review, the K-S1 has a notably higher overall DXO score than the A58 (overall score 4 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.2 bits higher color depth, 0.5 EV in additional dynamic range, and 0.5 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
# 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.
 
Sony A58 APS-C 19.8 5456 36321080/60i23.312.575374
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.
 
Nikon D3200 APS-C 24.1 6016 40001080/30p24.113.2113181
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.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
13.
 
Sony A77 II APS-C 24.0 6000 40001080/60p24.413.4101382
14.
 
Sony A5100 APS-C 24.0 6000 40001080/60p23.812.7134780
15.
 
Sony A6000 APS-C 24.0 6000 40001080/60p24.113.1134782
Note: DXO values in italics represent estimates based on sensor size and age.
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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 A58 provides a faster frame rate than the K-S1. It can shoot movie footage at 1080/60i, 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 A58 has an electronic viewfinder (1440k 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 K-S1 has a higher magnification than the one of the A58 (0.63x vs 0.57x), 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 A58, and comparable cameras.

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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.
 
Sony A581440 n2.7 / 460 tilting n 1/4000s 5.0/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.
 
Nikon D3200optical n3.0 / 921 fixed n 1/4000s 4.0/s Y n
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.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
13.
 
Sony A77 II2359 Y3.0 / 1229 full-flex n 1/8000s 12.0/s Y Y
14.
 
Sony A5100none n3.0 / 922 tilting Y 1/4000s 6.0/s Y n
15.
 
Sony A60001440 n3.0 / 922 tilting n 1/4000s 11.0/s Y n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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The K-S1 writes its imaging data to SDXC cards, while the A58 uses SDXC or Memory Stick PRO Duo cards. The K-S1 supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the A58 cannot take advantage of Ultra High Speed SD cards.

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Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Pentax K-S1 and Sony Alpha SLT-A58 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.
 
Sony A58Ystereo / monoY-mini2.0---
3.
 
Nikon D5500Ystereo / monoY-mini2.0Y--
4.
 
Nikon D5300Ystereo / monoY-mini2.0Y--
5.
 
Nikon D3200Ymono / monoY-mini2.0---
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.
 
Sony A68Ystereo / monoY-micro2.0---
13.
 
Sony A77 IIYstereo / monoY-mini2.0YY-
14.
 
Sony A5100-stereo / mono--micro2.0YY-
15.
 
Sony A6000Ystereo / mono--micro2.0YY-
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It is notable that the A58 has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The K-S1 does not feature such a mic input.

Both the K-S1 and the A58 have been discontinued, but can regularly be found used on ebay. The A58 was replaced by the Sony A68, while the K-S1 was followed by the Pentax K-S2. Further information on the features and operation of the K-S1 and A58 can be found, respectively, in the Pentax K-S1 Manual (free pdf) or the online Sony A58 Manual.

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Review summary

So what conclusions can be drawn? Which of the two cameras – the Pentax K-S1 or the Sony A58 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

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Reasons to prefer the Pentax K-S1:

  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores markedly higher (4 points) in the DXO overall assessment.
  • Better low-light sensitivity: Requires less light for good images (0.5 stops ISO advantage).
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.63x vs 0.57x).
  • Larger screen: Has a bigger rear LCD (3.0" vs 2.7") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (921k vs 460k dots).
  • Faster shutter: Has higher mechanical shutter speed (1/6000s vs 1/4000s) to freeze action.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More modern: Is somewhat more recent (announced 1 year and 6 months after the A58).

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Arguments in favor of the Sony Alpha SLT-A58:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • 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 framing info: Has an electronic viewfinder that displays shooting data.
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Less heavy: Has a lower weight (by 66g or 12 percent) and is thus easier to take along.
  • Longer lasting: Gets more shots (690 versus 410) out of a single battery charge.
  • More affordable: Was released into a lower priced segment (20 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in February 2013).

If the number of relative strengths (bullet points above) is taken as a guide, the K-S1 comes out slightly ahead of the A58 (10 : 9 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 10:09 A58

How about other alternatives? Do the specifications of the Pentax K-S1 and the Sony A58 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 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 A58. 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
# 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.
 
Sony A583/5......4.5/54.5/5 Feb 2013 599ebay.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.
 
Nikon D32005/5+ +..73/1004.5/54.5/5 Apr 2012 599ebay.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.
 
Sony A683/5......4/54/5 Nov 2015 699ebay.com
13.
 
Sony A77 II4/5....80/1004.5/55/5 May 2014 1,199ebay.com
14.
 
Sony A51004.5/5+....4.5/55/5 Aug 2014 549ebay.com
15.
 
Sony A60005/5+4.5/580/1004.5/55/5 Feb 2014 599ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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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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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 A58

    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 A58
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Pentax K mount lenses Sony A mount lenses
    Launch Date August 2014 February 2013
    Launch Price USD 749 USD 599
    Sensor Specs Pentax K-S1 Sony A58
    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 19.8 Megapixels
    Image Resolution 5472 x 3648 pixels 5456 x 3632 pixels
    Pixel Pitch 4.28 μm 4.31 μm
    Pixel Density 5.45 MP/cm2 5.41 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 1080/30p Video 1080/60i Video
    ISO Setting 100 - 51,200 ISO 100 - 16,000 ISO
    ISO Boost no Enhancement 100 - 25,600 ISO
    Image Processor PRIME MII BIONZ
    DXO Sensor Quality (score) 78 74
    DXO Color Depth (bits) 23.5 23.3
    DXO Dynamic Range (EV) 13.0 12.5
    DXO Low Light (ISO) 1061 753
    Screen Specs Pentax K-S1 Sony A58
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.57x
    Viewfinder Resolution 1440k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 2.7inch
    LCD Resolution 921k dots 460k dots
    LCD Attachment Fixed screen Tilting screen
    Shooting Specs Pentax K-S1 Sony A58
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/6000s 1/4000s
    Continuous Shooting 5.4 shutter flaps/s 5 shutter flaps/s
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDXC cards MS or SDXC cards
    Single or Dual Card Slots Single card slot Single card slot
    UHS card support UHS-I no
    Connectivity Specs Pentax K-S1 Sony A58
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi no Wifi
    Body Specs Pentax K-S1 Sony A58
    Battery Type Pentax D-LI109 Sony NP-FM500H
    Battery Life (CIPA)410 shots per charge690 shots per charge
    Body Dimensions 121 x 93 x 70 mm
    (4.8 x 3.7 x 2.8 in)
    129 x 95 x 78 mm
    (5.1 x 3.7 x 3.1 in)
    Camera Weight 558 g (19.7 oz) 492 g (17.4 oz)
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