Canon 1000D has a
10.0MP APS-C (22.2 x 14.8 mm ) sized CMOS sensor . On the other hand, Sony A77 has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor.
Sony A77's sensor provides 14MP more than Canon 1000D's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the 1000D and A77 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 1000D and Sony A77 Cameras
As seen above, Sony A77 has a 1.1x Larger sensor area than Canon 1000D. 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
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. Canon 1000D and Sony A77 sensors have been tested by DxO and the results show that A77 has a better overall score of 78, 16 points higher compared to 1000D's score of 62.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 1000D
62
22.0 bits
10.9 Evs
719 ISO
Sony A77
78
24.0 bits
13.2 Evs
801 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
Canon 1000D
or the
Sony A77 ,
including hyperfocal distance.
