Sony A200 has a
10.0MP APS-C (23.6 x 15.8 mm ) sized CCD sensor . On the other hand, Nikon D90 has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor .
Below you can see the A200 and D90 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A200 and Nikon D90 Cameras
Sony A200 and Nikon D90 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Sony A200 has 21% larger pixel area compared to Nikon D90, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Sony A200 and Nikon D90 sensors have been tested by DxO and the results show that D90 has a better overall score of 73, 10 points higher compared to A200's score of 63.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A200
63
22.3 bits
11.3 Evs
521 ISO
Nikon D90
73
22.7 bits
12.5 Evs
977 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 A200
or the
Nikon D90 ,
including hyperfocal distance.
