RE: [ATM] Alan Scott's Deep Space telescope

[Mark Holm <mdholm@telerama.com>]

Protostar sells some flocked paper that is specially chosen for 
telescope baffling.  They say it is non-shedding,  stands up to a 
reasonable amount of handling, and isn't bothered by dew.  Protostar is 
a quality outfit.  I doubt they would make an advertising claim that 
wasn't reasonably warranted.  I haven't used this material, so I am only 
passing on their advertising info.  They have a web site.  Google for them.

Don't forget a ring baffle under your focuser.  It is the most effective 
and most weight saving place to put one.  I think Mel Bartels web site 
shows how and where to locate it.  You could build a filter slide under 
the focuser and incorporate the ring baffle into that.

The next most weight saving place to put one is just behind the 
diagonal.  A combo of a ring baffle under the focuser and a baffle 
behind the diagonal is probably the lightest weight scheme.  The behind 
the fdiagonal location does have disadvantages.  More diffraction in the 
light path.  More mass and wind catching area suspended on the spider.

-- 
Mark Holm
mdholm@telerama.com


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