What Secondary Mirror size for short focus scopes?
Does anyone know what the oversize secondary mirror size is for a 6" F4 or F5 Newt.?
I'm putting together a short focus scope for digital (full frame) imaging and need the bigger secondary using a Crayford 10:1 focuser. Tube is ~175mm dia.
Perhaps there is a calculator one can add in their specs and bingo! there's the size.
Here is a link to a thread on CN discussing a smal secondary but it links o a program for secondary calculation CN secondary thread
Is the chip size in your camera 36x24mm? I would have thought a secondary of 43mm would have it covered, do you have a low profile 2" focuser?
