[ATM] 6 inch f/4

[Chris Plicht <cap@plicht.de>]

Hello all.

Yesterday I finished a 6" f/4 mirror. It began life as the tool for my 
very first 6" f/6, but since it is of Duran (the Schott equivalent to 
Pyrex) I thought it might be worth giving it a decent concave surface. 
It was hard to put it on the pitch again when l/4 was achieved, but with 
10 more sessions I finally call it finished with lambda/6.

Now I have to build a telescope around the mirror, which will be the 
harder part for me.
Picture and data may be found at: 
http://www.plicht.de/chris/atm/150n7_011.jpg

Take care,
Chris

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