Olympus E-P1 has a
12.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic V processor. On the other hand, Panasonic GX1 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine FHD processor.
Below you can see the E-P1 and GX1 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus E-P1 and Panasonic GX1 Cameras
Olympus E-P1 and Panasonic GX1 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 Olympus E-P1 has 29% larger pixel area compared to Panasonic GX1, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
DxOMark Sensor Scores
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Olympus E-P1
55
21.4 bits
10.4 Evs
536 ISO
Panasonic GX1
55
20.8 bits
10.6 Evs
703 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
Olympus E-P1
or the
Panasonic GX1 ,
including hyperfocal distance.
