Panasonic G1 has a
12.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Panasonic GX7 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor.
Below you can see the G1 and GX7 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic G1 and Panasonic GX7 Cameras
Panasonic G1 and Panasonic GX7 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 Panasonic G1 has 31% larger pixel area compared to Panasonic GX7, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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 G1 and Panasonic GX7 sensors have been tested by DxO and the results show that GX7 has a better overall score of 70, 17 points higher compared to G1's score of 53.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Panasonic G1
53
21.1 bits
10.3 Evs
463 ISO
Panasonic GX7
70
22.6 bits
12.2 Evs
718 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 G1
or the
Panasonic GX7 ,
including hyperfocal distance.
