Re: ATM your refractor

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Jerald F. Wright wrote:
 >
 > "Richard F.L.R. Snashall" wrote:
 >
 >
 >
 >>Progress, however, is slow... rumor has it that means I'm learning a
 >>lot;-)
 >>
 >>                Rick S.
 >
 >
 > When you get that thing done if it performs anywhere near design it 
will be some super
 > scope.
 > I'm sure you are learning a bunch.  Are you planning to have anti 
refletion coatings
 > applied to the finished glass and have you polished all surfaces yet 
or are you doing
 > one at a time?  Seems the last I heard you were calibrating the 
spherometer.
 >

The spherometer goes into the shop next week (I hope).

The first lens position has actually been polished twice.  I'm
still trying to get a feel for knowing when I can consider the
surface spherical.  There doesn't seem to be any way to get
feedback into the loop just yet, except where the lenses must
mate, and we know where that went.

In this design, only the last lens really needs to have AR coating
to reduce any ghost (4 mm diameter).  It might just be easier to
get them all coated, though, depending on the cost.  I don't know
the cost yet... or where to get it done...

		Rick S.

 > Jerry
 >
 >