Nikon D300S has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor and features Expeed processor. On the other hand, Canon 40D has a
10.0MP APS-C (22.2 x 14.8 mm ) sized CMOS sensor .
Below you can see the D300S and 40D sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D300S and Canon 40D Cameras
As seen above, Nikon D300S has a 1.1x Larger sensor area than Canon 40D. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
DxOMark Sensor Scores
Both Nikon D300S and Canon 40D 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, D300S has scored 70, 6 points higher than 40D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon D300S
70
22.5 bits
12.2 Evs
787 ISO
Canon 40D
64
22.1 bits
11.3 Evs
703 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
Nikon D300S
or the
Canon 40D ,
including hyperfocal distance.
