I have an Epsilon 130ed, which is the backfocus recomended, the stars in the corner looks like unfocused. I use a camera zwo 2600mm pro with EFW 7X2.
I have an Epsilon 130ed, which is the backfocus recomended, the stars in the corner looks like unfocused. I use a camera zwo 2600mm pro with EFW 7X2.
56.2mm.
56.2mm + 1/3 of your filter thickness