Re: [ATM] 6-pole

[Dale Eason <atmpob@yahoo.com>]

See my example at:
http://home.comcast.net/~doeason/16inchscope.html

The main advantage for me was weight saving in the
upper end.  My mirror is only 20 lbs and I don't want
to add any counter weight if possible.

8 poles are not needed to counteract gravity in fact
only the trusses on the side are doing most of the
work in that regard.  To prove that I once removed the
top and bottom trusses from an 8 pole version and
except of side to side motion it all worked very well.

You can see from the pictures that I have a hinged lid
and it does not get into the light path.  

Keeping a shroud out is a little more problematic but
The new Obsession 18" UC does it quite well using a
couple of light weight ring battens inserted into the
shroud.

Dale Eason




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