Sigma Quattro has a 29.0MP APS-C (23.5 x 15.6 mm ) sized CMOS (Foveon X3) sensor and features Dual TRUE III processor. You can shoot at maximum resolution of 5424 x 3616 pixels with aspect ratios of 1:1, 4:3, 3:2 and 16:9. Quattro has a native ISO range of 100 - 6400 and it can save files in RAW format which gives you a wider room for post processing.
Sigma Quattro is not the highest resolution APS-C camera. Fujifilm X-E5 with its 40.0MP sensor is leading in this class. Check the comparison of Sigma Quattro vs Fujifilm X-E5 or take a look at Highest resolution Mirrorless cameras list.
Anti-Aliasing Filter
Another important feature about Sigma Quattro's sensor is the lack of anti-alias (Low-pass) filter. Removing anti-aliasing filter increases the sharpness and level of detail but on the other side it also increases the chance of moiré occurring in certain scenes.
Let's look at how the size of the Sigma Quattro's APS-C sensor compares with other standard sensor sizes.
Comparison image of Sigma Quattro Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Sigma Quattro gives you at any given aperture.
You can
calculate
the exact depth of field for the Sigma Quattro
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.
