A few questions for those who use rotators (pyxis rotator specifically) Do you maintain a library of flats with a set for every 5 deg or so ( 0, 5, 10, etc) and then make sure ur PA's for images are a multiple of 5; or just add to the library for exact PA's as you need them? I have been trying to do the latter, but am finding the task of keeping them organized a bit daunting. Also, do you find the repeatablitiy (is there such a word?) of the PA by the pyxis good enough that the flats made weeks earlier are useable? It seems to me that "pretty close" would not be good enough