Quote:
Originally Posted by clive milne
|
Both of these are 4 inch focusers and corrected circle varies. In this case Tak is ahead (the old Tak versus AP competition eh?).
See the TOA FL35 only has a 40mm corrected circle - thats the 2.7 inch flattener that vignetted terribly on my FS152 and was unusable with an STL11 camera. It could be my data is limited here to only an older type scope as my TEC110 would handle an
STL11 and its about a 2.7 inch focuser.
Your TOA would be 4 inch if it handles the 67 flattener as it has a 90mm corrected circle so it must be quite large.
TOA scopes have a different optical configuration to the older FS doublets so it may be less of a problem with them (I did hear a report from someone who was using 2.7 inch focuser successfully with STL11). The point being you'd have to make sure before you spent $7000 on a refractor with a 2. inch focuser that it could handle a chip that large if that was your intended use. It would be an expensive mistake if it doesn't.
Greg.