Quote:
Originally Posted by Darkplague
Some nice scopes there!
So to change the pupil distance on these scopes, you have to slew the UTA ring around to where you need it, is this how it is done?
Looking at that last picture, its looks to be quite a pain to move those rings with all those bolts holding them but I am only guessing.
The only drawback that I can see is that if you have to refocus anything, this will also affect your pupil distances, therefore requiring you to move those top rings, possilbly putting it slightly out of collimation each time  |
Hi Mark
On the design that Mark brought to Lostock, the upper rings are mounted on teflon pads and are kept in place longitudinally by keeper roller bearings (see photo). A handle on each lets the observer just rotate them as they require. In situations like Lostock - where lots of different people look through them over a session - these are a boon. Rotating them does slightly affect collimation, but there are adjusters that are easily reached from the front to trim the mirrors on the fly. I suppose that the picture you refer to shows a scope that is more-or-less set for that individual.
Cheers
Chris