Quote:
Originally Posted by PRejto
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thanks for that Peter, I did kind of ignore whether coma correction was required i was thinking perhaps f8 might be fairly insignificant but I wasn't aware of these barlow-field correctors which would obviously do a better job
as the coma would be still there just less obvious.
I think with the baader it would need be setback around 57mm (TSOAG9 44+11+2mm and magnifications and the back spacing required: 2x = 42 mm, 3x = 96.2 mm, 4x = 150 mm,) which would give a magnification of about 2.3 which would make the scope f9.2 ish - a little slower than I was after but not diabolical.
if I interpret the AP barlow info correctly a setback from the chip needs to be 90mm (for 2x) so I've got more room to play with (plus its in my price range) so i'd need about a 33mm spacer which is doable... well a 10mm spacer think my existing variable spacer is 17-23mm (for my TSOAG9 + RCCi combo) so that's easy enough.
thanks for the tips (again)
that's exactly the type of info I was after.
Rusty