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Pentax K-S2
Pentax K-3 II
Pentax 645Z
Pentax K-S1
Pentax QS-1
Pentax K-S2
Pentax K-3 II
Pentax 645Z
Pentax K-S1
Pentax QS-1
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Release Date
Apr 2015
Jun 2015
Jul 2014
Jan 2015
Dec 2014
Focus Type
Contrast Detect (sensor), Phase Detect, Multi-area, Center, Selective single-point, Tracking, Single, Continuous AF, Face Detection, Live View, Manual focus
Contrast Detect (sensor), Phase Detect, Multi-area, Center, Selective single-point, Tracking, Single, Continuous AF, Face Detection, Live View, Manual focus
Contrast Detect (sensor), Phase Detect, Multi-area, Selective single-point, Tracking, Single, Continuous AF, Face Detection, Live View, Manual focus
Contrast Detect (sensor), Phase Detect, Multi-area, Center, Selective single-point, Tracking, Single, Continuous AF, Face Detection, Live View, Manual focus
Contrast Detect (sensor), Multi-area, Center, Selective single-point, Tracking, Single, Continuous AF, Face Detection, Live View, Manual focus
Frames Per Second
5.4 Frames
8.3 Frames
3.0 Frames
5.4 Frames
5.0 Frames
Camera Type
Compact SLR
Mid-size SLR
Large SLR
Mid-size SLR
Rangefinder-style mirrorless
Resolution
20.0 Megapixel
24.0 Megapixel
51.0 Megapixel
20.0 Megapixel
12.0 Megapixel
Image Sensor Type
CMOS
CMOS
CMOS
CMOS
BSI-CMOS
LCD Screen Size
3.0 in.
3.2 in.
3.2 in.
3.0 in.
3.0 in.
Image Sensor Size
28.2 mm
28.2 mm
55.0 mm
28.2 mm
1.97 mm

The Pentax K-S2 is an attractive option for photographers who don't put an emphasis on video capture.

Disappointing video features

A bit like a bigger version of the Pentax K-3

Ultimately the K-S1 is a very capable camera that, ironically, is let down by some of the very aspects intended to make it stand out.

For those looking for an ultra small compact system camera, the Pentax QS-1 is a reasonable option, especially if you've got some kind of affinity to the Pentax brand.