Pentax K-5 has a
16.0MP APS-C (23.7 x 15.7 mm ) sized CMOS sensor and features Prime II processor. On the other hand, Nikon D300S has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor and features Expeed processor.
Below you can see the K-5 and D300S sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-5 and Nikon D300S Cameras
Pentax K-5 and Nikon D300S have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
Both Pentax K-5 and Nikon D300S sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, K-5 has scored 82, 12 points higher than D300S.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-5
82
23.7 bits
14.1 Evs
1162 ISO
Nikon D300S
70
22.5 bits
12.2 Evs
787 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Pentax K-5
or the
Nikon D300S ,
including hyperfocal distance.
