Panasonic GF1 has a 12.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine HD processor. You can shoot at maximum resolution of 4000 x 3000 pixels with aspect ratios of 1:1, 4:3, 3:2 and 16:9. GF1 has a native ISO range of 100 - 3200 and it can save files in RAW format which gives you a wider room for post processing.
Panasonic GF1 is not the highest resolution Four Thirds camera. Panasonic GH7 with its 25.0MP sensor is leading in this class. Check the comparison of Panasonic GF1 vs Panasonic GH7 or take a look at Highest resolution Mirrorless cameras list.
Panasonic GF1 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Panasonic GF1 sensor has been tested by DxO Mark and got an overall score of 54 for its image quality. You can find the details of their analysis of Panasonic GF1 here.
Let's look at how the size of the Panasonic GF1's Four Thirds sensor compares with other standard sensor sizes.
Comparison image of Panasonic GF1 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Panasonic GF1 gives you at any given aperture.
You can
calculate
the exact depth of field for the Panasonic GF1
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and the very shallow focus zone you get with long telephoto lenses.
