Hello, Nik
I have used both a DMK21AF04 (640x480) and a DMK31AF04 (1024x768) CCD cameras from the Imaging Source, both are mono.
- The pixel size on the DMK21 is 5.6μm x 5.6μm.
- The pixel size on the DMK31 is (smaller) 4.65μm x 4.65μm.
When I record an image of say, Jupiter with the DMK31, it appears larger on screen that the DMK21, because the DMK31 put more pixels on the disc of Jupiter due to its smaller pixel size, compared to the larger pixels on the DMK21.
Canon DSLR's have varying pixel sizes e.g. Canon 7D is approx. 4.3μm whereas the Canon 5D Mk III is around 6.2μm so once again, on a small planetary disc, the 7D will put more pixels on the disc and therefore the image will appear larger on a computer display.
Hope that helps.
Cheers
Dennis