Conversion of detector units into physical ones, i.e. mJy per pixel, is simply done by dividing the reduced data by a constant value. As listed in the ISOCAM handbook, these factors have varied little since their pre-launch values (the largest variation observed was in fact due to an error in ground-based calibration). For completeness I list in the following table the conversion coefficient, for LW and SW as their appear in Version ## of the document (July 99). If you suspect they could have changed, check the ISOCAM section on the ISO explanatory supplement.
|Filter||Reference Wavelengtha||Conversion Factor||rms|
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The bandwidth is a crucial when you want to properly compute a luminosity in a filter. Yet, since the filters are not perfectly rectangular (to say the least), deriving their bandwidth requires some computation. Furthermore, given that a spectral shape convention was used you need to compute the bandwidths with the same convention. This is what has been done here, using the filter curves in the ISOCAM cookbook as quantum efficiencies.
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