Canon A3300 IS has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features DIGIC 4 with iSAPS technology processor. On the other hand, Sony T90 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the A3300 IS and T90 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon A3300 IS and Sony T90 Cameras
Canon A3300 IS and Sony T90 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 T90 has 32% larger pixel area (2.34µm 2 vs 1.76µm 2 ) compared to Canon A3300 IS, it has larger pixel area to collect light hence potential to 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 A3300 IS
or the
Sony T90 ,
including hyperfocal distance.