Canon EOS C400 has a
19.0MP Full frame (36 x 24 mm ) sized BSI Stacked CMOS sensor . On the other hand, Blackmagic Cinema 6K has a
24.0MP Full frame (36 x 24 mm ) sized CMOS sensor .
Blackmagic Cinema 6K's sensor provides 5MP more than Canon EOS C400's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the C400 and Cinema Camera 6K sensor size comparison.
Sensor Size and Resolution Comparison image of Canon EOS C400 and Blackmagic Cinema 6K Cameras
Canon EOS C400 and Blackmagic Cinema 6K 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 Blackmagic Cinema 6K has 9% larger pixel area (35.00µm 2 vs 32.00µm 2 ) compared to Canon EOS C400, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
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
Canon EOS C400
or the
Blackmagic Cinema 6K ,
including hyperfocal distance.
