[ATM] Mike lockwood's flats page

[David Margrave <david.margrave@gmail.com>]

Mike,

thanks for posting those pictures.  I am also working on the
three-disc flat method with 3 8" pyrex blanks.   I am going to set up
a light box like you have done, with compact flourescent lights and
red or green tint.  I got the red and green film from Tap Plastics,
and also picked up some silver tint which seems to have one-way
mirror-like properties, so I'm hoping i can just use that as my 45
degree reflective surface to view the fringes.  I scrounged around for
a while but couldn't find a low pressure sodium or mercury light.  I
did find high pressure sodium at the big box stores and also a company
called Kelsun distributors in Bellevue, WA.   Could you explain a bit
more about your black light source?

At this point I have my 3 blanks fine ground but not polished.  I am
also working on an 8" f/8 spherical mirror which I will use for
conducting the ritchey-common test on my candidate flats.  I suppose I
am just making extra work for myself but I like to use more than one
testing method.

Dave
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