Field of View 0.98 x 0.74
Posted: Fri May 08, 2020 11:02 pm
Greetings,
I recently purchased a new QHY 16200A CFW7 camera that with the supplied OAG and adapter is 2.4 mm longer than the required back focus for my reducer/flattener. I might be forced to ditch the OAG and use a finder scope. I currently use a ZWO 30F4 with a ZWO ASI 120MC-S for polar alignment and it sees lots of stars to a fair degree. I was considering getting a longer focal length finder scope such as the ZWO 60280 which gives a rather narrow Field of View of 0.98 x 0.74 (from Astronomy Tools). I do polar alignment with SharpCap because I am in the southern hemisphere in a Bortle 5/6 area and can't see Octans for most of the month. Would such a narrow field of view muck about with my ability to see enough stars for good polar alignment. Even with the 30F4, SharpCap gets a bit upset if I am not looking in roughly the right direction.
Regards
Stephen
I recently purchased a new QHY 16200A CFW7 camera that with the supplied OAG and adapter is 2.4 mm longer than the required back focus for my reducer/flattener. I might be forced to ditch the OAG and use a finder scope. I currently use a ZWO 30F4 with a ZWO ASI 120MC-S for polar alignment and it sees lots of stars to a fair degree. I was considering getting a longer focal length finder scope such as the ZWO 60280 which gives a rather narrow Field of View of 0.98 x 0.74 (from Astronomy Tools). I do polar alignment with SharpCap because I am in the southern hemisphere in a Bortle 5/6 area and can't see Octans for most of the month. Would such a narrow field of view muck about with my ability to see enough stars for good polar alignment. Even with the 30F4, SharpCap gets a bit upset if I am not looking in roughly the right direction.
Regards
Stephen