Good day AstroFriends,
I have a 0.5 focal reducer and a Field Flattener and i would like to use them both on my AT66 refractor.
Have anybody used such combinations?. i'd like to know how to place each of them in respect to back focus.
I figure, i should use the reducer first and then "correct it" with the flattener.
My reducer is the TPO 0.5 2" thread on reducer and the FF is the GSO flattener.
thanks for any tips,