Imaged areas around this a lot for HOYs but never this actual part. First time back using the MPCC without the LP filter this time to avoid internal reflections. Stars are better at 3 corners but top right still off – probably focuser alignment.
|Telescope||250mm f4.8 Newtonian, MPCC|
|Camera||Atik 460EX @-15°C|
Baader Ha, OIII filters
|Exposure(s)||10x300s each Ha, OIII|
Darks, flats, bias