Sony A37 has a
16.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor . On the other hand, Pentax K-r has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor and features Prime II processor.
Below you can see the A37 and K-r sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A37 and Pentax K-r Cameras
Sony A37 and Pentax K-r 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 Sony A37 and Pentax K-r 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, A37 has scored 75, 3 points higher than K-r.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A37
75
23.3 bits
12.9 Evs
799 ISO
Pentax K-r
72
22.9 bits
12.4 Evs
755 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
Sony A37
or the
Pentax K-r ,
including hyperfocal distance.
