In Siril’s photometric color calibration panel the focal length of the telescope changes from what I set (660 mm) to a different value (653.9 mm). In fact, no matter what number I put in for the focal length it come back with 653.9 mm. I assume there must be a setting hidden somewhere which is overriding my input (which does not make sense). Any suggestion as to what I need to do to fix this?
Siril 1.0.6 in Parallel running Ubuntu on M1 Mac