Re: [ATM] what kind of material makes up the lenses in an eyepiece?

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

Peter John Smith has web pages on making eyepieces
from scratch. 
However, there is an easier method, which I've used,
for making Plossl or Symmetric eyepieces: you take 2
small achromat doublets, which you can obtain VERY
cheaply from Surplus Shed, and you affix them together
so that the convex elements are ALMOST touching, and
there you have your eyepiece.
Good Luck.
Guy
--- David  Williams <dwilliams1128@earthlink.net>
wrote:
> Hello
> 
> Can you use the Schott KF4 material that was
> advertised just before to make up the lenses in an
> eyepiece?  I've heard that some of them are BK-7 and
> some of them are Flint glass.  Is this true?  And
> what kind of material is the tool that you use to
> grind the lens to the right curve?  Can you use a
> metal tool?  
> 
> Does anyone have the resources for the making of
> different eyepieces? (that would be helpful)
> 
> Thank you
> dwilliams1128@earthlink.net
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> ATM mailing list http://www.atmlist.net/
> 


=====
Guy  Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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