I'm trying to do some double star measurements with an Alt-Az manually controlled scope and a DSLR
using the lucky imaging technique found on JDSO papers.
Understood that i have to take drift observations for PA calibration immediately after imaging run for each run due to field rotation that occurs on alt-az setups.
For plate scale calibration im planning to do measure 3-4 doubles of well known orbits in the start or the end of the night.
If im getting it right from what ive read, if the camera doesnt moves at all during the night and focus remains intact, than plate scale isnt changing.
Is that right? Even if the doubles i measure are spread throughout the sky?
BTW im using REDUC for reductions and drifts analysis
Edited by vvars, 23 September 2019 - 09:32 AM.