Canon SX40 HS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Canon A2500 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the SX40 HS and A2500 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon SX40 HS and Canon A2500 Cameras
Canon SX40 HS and Canon A2500 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 Canon SX40 HS has 32% larger pixel area compared to Canon A2500, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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 SX40 HS
or the
Canon A2500 ,
including hyperfocal distance.
