Ok I keep that in mind for the 2" eyepieces, Notdarkenough suggested it also.
I didn't had the time to search google yet, In the manual, the telescope comes with 1.25" diagonal, can it take a 2" diagonal directly?
Yes, it can. There are a couple ways you can go:
1. You can get a 2" SCT diagonal. This diagonal attaches directly to the threaded port of the scope. Eliminating the visual back.
2. You can install a 2" visual back with a separate 2" diagonal.
If you directly attach the VB to the scope, you'll get a shorter light path and more clearance between the diagonal and base of the telescope when pointing toward zenith.
If you use a visual back with diagonal, you'll be able to rotate the diagonal so that the eyepiece is pointing in a convenient direction for viewing. In Alt/Az mode, this is not such a big deal. However, there are other advantages insofar as filter use is concerned. With this setup you can install a filter on the diagonal and a filter on the eyepiece. This is really handy when using two single polarizing filters. It allows you to rotate the eyepiece while looking through it to get just the right amount of polarization. Using method 1. you can only thread filters onto the end of the eyepiece.
Method 2 with f/6.3 reducer/corrector:
Method 2 without reducer/corrector:
In method 1. above, I didn't screw the diagonal on because I would have to remove the EP clamp so the body would clear the focus knob, screw it on, then reinstall the clamp. Being lazy, I simply held it up there to illustrate how it would go on. Also, method 1. requires the use of a locking ring. Well "requires" is kind of a strong word, it's only required if you want to orient the eyepiece pointing "up". If you're happy with it pointing where ever it ends up, then the locking ring is optional.
Edit: Additionally, you can attach the f/6.9 corrector/reducer directly to the back of the SCT and then attach the SCT diagonal to the reducer. You'll still want to install a locking ring between them, though.
Also, keep in mind, the f/6.9 corrector/reducer is not recommended for eyepieces longer than 32mm.
Edited by wrvond, 23 July 2021 - 12:34 PM.