Sigma BF has a
24.6MP Full frame (36 x 24 mm ) sized CMOS sensor . On the other hand, Sony A7c has a
24.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz X processor.
Another difference between these two cameras is that Sigma BF's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the BF and A7c sensor size comparison.
Sensor Size and Resolution Comparison image of Sigma BF and Sony A7c Cameras
Sigma BF and Sony A7c have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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
Sigma BF
or the
Sony A7c ,
including hyperfocal distance.
