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When using the WWW Exposure Time Calculator for polarimetry, what is the source flux I have to input?

When using the WWW Exposure Time Calculator for polarimetry, what is the source flux I have to input?

The TOTAL source flux can be input in the Exposure Time Calculator. The Calculator takes care of using only half of the input flux for estimates of the exposure time with the polarizers, which is correct for an unpolarized source. For a strongly polarized source, of course, the detected flux will be larger or smaller than this for a strongly polarized source, depending on the polarization angle of the source relative to each of the three polarizers.