Sony A58 has a
20.0MP APS-C (23.2 x 15.4 m ) sized CMOS sensor . On the other hand, Panasonic GF7 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor.
Below you can see the A58 and GF7 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A58 and Panasonic GF7 Cameras
As seen above, Sony A58 has a 1.5x Larger sensor area than Panasonic GF7. 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.
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 A58
or the
Panasonic GF7 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(APS-C versus Four Thirds),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
