Pentax K-m has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor . On the other hand, Canon 300D has a
6.0MP APS-C (22.7 x 15.1 mm ) sized CMOS sensor .
Below you can see the K-m and 300D sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-m and Canon 300D Cameras
Pentax K-m and Canon 300D 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-m and Canon 300D 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-m has scored 64, 9 points higher than 300D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-m
64
22.4 bits
11.4 Evs
513 ISO
Canon 300D
55
21.0 bits
10.8 Evs
544 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-m
or the
Canon 300D ,
including hyperfocal distance.
