Both Panasonic GH2 and Leica TL have 16.0 MP resolution sensors but Panasonic GH2's sensor is Four Thirds (17.3 x 13 mm ) and Leica TL's sensor is APS-C (23.6 x 15.7 mm ).
Since Leica TL's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Panasonic GH2.
Below you can see the GH2 and TL sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic GH2 and Leica TL Cameras
As seen above, Leica TL has a 1.6x Larger sensor area than Panasonic GH2. 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
Panasonic GH2
or the
Leica TL ,
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.
