From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


The glass is listed in my list of B&L glasses as a crown glass with all
of the various indices as needed to do a design.  It is somewhat close to
K01 in the OHara glasses as well but not exactly the same. Without the melt
papers, the B&L numbers should do very nicely for a starting point to
making a decent telescope. FWIW, I may be interested in the glass if it is
12" in diameter as I already have a Flint and a Short Flint glass that
may go decently well with it but I haven't done a raytrace to find out if
it really is right. If the glass is in the 8" diameter or a little
less, I have a piece of DF4 with a sharp curve in one side that you may
find quite useful for making a decent doublet of fair quality.  The glass
is 8 1/2" in diameter and is approx. 1" thick in the center and
has a gentle convex on the other side. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

--- BBBS/NT v4.00 MP