Panasonic G6 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Sony A58 has a
20.0MP APS-C (23.2 x 15.4 m ) sized CMOS sensor .
Below you can see the G6 and A58 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic G6 and Sony A58 Cameras
As seen above, Sony A58 has a 1.5x Larger sensor area than Panasonic G6. 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. Panasonic G6 and Sony A58 sensors have been tested by DxO and the results show that A58 has a better overall score of 74, 13 points higher compared to G6's score of 61.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Panasonic G6
61
21.3 bits
11.5 Evs
639 ISO
Sony A58
74
23.3 bits
12.5 Evs
753 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
Panasonic G6
or the
Sony A58 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(Four Thirds versus APS-C),
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.
