|
The 12 Nagler could simply be used as a 1.25" eyepiece, requiring a lot of in-focus, and eliminating that problem.
The 17, though, is a harder issue to solve, but solvable it is: add a 2" barrel extender to the eyepiece and a 2" parfocalizing ring.
That way, the eyepiece will stop at the right point AND have sufficient barrel in the focuser to be safe.
It's a simpler solution than:
--adding a longer focuser drawtube to your focuser
or
--using an extension tube, which will require about 2" of in-focus. Since you're using 1/2" of out focus, you might not have enough travel in the focuser to reach focus, and when you can't reach focus on the inside of the focuser's travel, it's a much harder problem to solve.
|
