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Detailed calculation:

for the selected configuration,, and (S/N), compute:
S = expected signal due to the Zodiacal light.
K = for a point source, or 1 for an extended source. This factor takes into account the size of the PSF. It assumes that the point source flux is spread uniformly over pixels.
s = expected signal due to the source.
= function of S and (see section gif).
= function of S and (see section gif).
.
= .
Then solve for :



ISOCAM Observer's Manual - V1.0
Tue Oct 31 12:06:23 MET 1995