Quote:
Originally Posted by tnott
PS: Mel Bartels and some other experienced telescope makers really don't see a shroud as necessary on a dob (esp. at a dark site), as long as it is properly baffled:
http://www.bbastrodesigns.com/tm/ul-dobs.html
I think I have worked out a method in theory though, involving spiraling springy wire around the tube like air conditioning tubing, then pulling a shroud over the top....hmmm.  |
On the little 8" truss dob I built for my sons, it has an exposed secondary like
your design but slightly different. The thing I found most annoying was when
you look through the EP your mouth is pointing right at the secondary mirror
and unless you continually held your breath it would fog up all the time. In
the end I got sick of doing that and made a shroud. The difference in
performance as well as ease of use not having to hold our breathe has made
it a pleasure to use.
Btw, on another note, are you intending to add an Argo Narvis system to
this design? I'm about to start my next scope and hope to be ordering bits
around the end of this month, so I'm also looking at compact designs.
regards,CS