[Brian W (Brian)]

Hi all, it has moved into cloudy season over here so I am doing my usual surfing when I come across the Nasmyth optical system for reflectors.

Just wondering if anyone knows about this system. In particular (1) how much would the added mirror cut down on what is seen (2) how is it collimated.

Seems it could be possible to make a very nice planetary scope this way without needing oxygen as you climb to the ep.
Brian