Quote:
Originally Posted by gregbradley
So aperture and QE still remain the 2 most important factors in the speed of the system and F ratio is more the wideness of the field.
Greg.
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No, actually they are not. As indicated in the first post, FNumber and pixel size are by far the most important factors in sensitivity, because they are squared terms. QE and optics efficiency also come into it.
focal length and total chip area determine the wideness of the field.
the CDK/694 was much less sensitive than the RHA/694 because your CDK/694 system is heavily oversampled whereas the RHA/694 is properly sampled. For interest, you could use the formula to work out the relative sensitivities of the two systems....