re:eyepice lenses

[P3D Elliot Burke <elliotb@xxxxxxxxxxxxx>]

>Subject: Viewer eyepiece lenses
>Message-ID: <v02130502ae30eeb60e18@[129.46.192.218]>

 > I'm building a modified King Inn viewer. I'm planning to use a full
>spectrum flourescent tube and the best eyepiece lenses that I can find. Are
>there any sources of eyepieces other than Edmund? They seem to have only
>two element lenses. I need eyepieces somewhere between 60mm. focal length
>and 100mm. focal length and a diameter of 40mm. or larger. Possibly I could
>have something designed from stock lenses.

>Thank you,   Dennis Selwa
There are a number of stock lens manufacuturers.
Domestically, 
Esco
Rolyn
Melles Griot
Newport Corp
there are some German sources whose name escape me
Casix in China is very inexpensive.

If there were sufficient demand for a quantity of eyepiece lenses of one specific type, 
a quantity order could be made for a custom lens, greatly decreasing cost.  By going 
offshore and buying in thousands, the lenses could be had for just a few dollars each 
(coated achromat).
High speed grinding and polishing machines take some tooling, but they can generate a 
surface in 30 seconds or so.  4 surfaces/lens, == 2 minutes/lens.  If made from molded 
blanks, the only other operations are coating (1000 pieces/coating run) and cementing 
(alas, still one at a time).  A 10 hour run gives 3000 complete achromats.  It is this 
kind of quantity where serious prices breaks begin.
Any interest?

Elliot Burke
HighTide Instruments
elliotb@xxxxxxxxxxxxx
http://www.netcom.com/~elliotb/hightide.html


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