Subject: Re: anyone interested in slit masks with DIS?

From: jeg@astro.Princeton.EDU

Submitted: Thu, 21 Dec 2000 17:20:38 -0500 (EST)

Message number: 82 (previous: 81, next: 83 up: Index)

My experience with machined masks has not been good, because of
nonuniformities along the edges. It is necessary that the slit width
be very accurately constant and smooth for good sky subtraction. If
these work well, fine, but be careful...you need a very good machine
with a high spindle speed, very slow cuts, and VERY sharp tools to
have a prayer--unless, of course, your objects are bright. I think
that chem milling or laser cutting or photography is likely to be
better.

--jim


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