Diagonal for Nexstar 8SE that won't hit base mount
Posted 30 December 2012 - 08:50 AM
Posted 30 December 2012 - 02:02 PM
Posted 30 December 2012 - 03:15 PM
Astronomics catalog listing for SCT Short Adapter
Astronomics catalog listing for Televue Short Diagonal
You can ask on the SCT forum if someone can confirm that this will work if your scope does not have a dovetail mount.
There is one other option that results in an even shorter unit. The Baader diagonals all accept the Baader T2 accessories. One of the accessories that Baader sells is a SCT to T/2 converter. This is only 15mm long (about 1/3" shorter than even the Televue short diagonal and short adapter). This would give you the best chance of clearance, and additionally, would give you the shortest possible light path, resulting in the widest possible true field your scope can provide using 2" eyepeices and working at full aperture.
And the Baader has this too. For less than the Televue diagonal, you can buy the Baader 2" Mirror diagonal with a 2" Clicklock eyepiece holder! Now you're talking!
Look at figure #3 on this page for a picture of how short this setup is. You can't get any shorter than this and still be able to rotate the diagonal (there is a 10mm adapter, but it does not allow diagonal rotation)....
Picture of Baader unit with short adapter on SCT... See figure 3
And finally there is the cheap solution... As I recall, Celestron used to sell a short SCT diagonal that was intended to work for scopes that had limited fork clearance.
I believe Meade may have offered one too.
Posted 30 December 2012 - 09:28 PM
Your 8SE should have a dovetail rail on the side of the scope, which is held onto the mount with a clamp and a big thumbscrew. You can loosen the clamp and slide the tube forward to allow more clearance.
The stock unit will definitely clear the base on an 8SE if the dovetail is properly adjusted.
Posted 31 December 2012 - 03:02 AM
Posted 31 December 2012 - 09:32 AM
Posted 31 December 2012 - 09:40 AM
Once it is screwed to the Nexstar can you still turn it sideways or is it locked ?
Actually, william optics makes a 2" diagonal and sct low profile adapter. The way it works is that you unscrew the nosepiece from the diagonal and screw on the adapter. Then unscrew the stock visual back from the scope and screw on the diagonal. This combo will clear the base on the 8se.
Posted 31 December 2012 - 10:23 AM
Posted 31 December 2012 - 10:28 AM
Posted 31 December 2012 - 10:51 AM
That is where the Boys that run an 8se hang out...
and the topic you are interested in has been discussed many many times..
There is also dicussions about modifying the dovetail to allow even more adjustment room..by using either Rons rail or Eddies Bracket... both cheap and very effective solutions ..
I run a Denkemier 2 inch P/S diagonal on both my 8i (earlier model of the 8Se) as well as on my CPC1100 my 8i uses Rays Bracket BUT I can clear the base with room spare to with the 8i on the very few nights I find a need to actually observe at Zenith..
BTW... I read and replied to you one post about eyepieces on the other Asrto forum.. I think you will find more help here then over there with your specific scope..
Posted 31 December 2012 - 11:12 AM