Making a focus screen from UV filters and Microwax?

From: jlafferty (ideaspora_at_hotmail-dot-com.no-spam.invalid)
Date: 03/11/05 

Date: 11 Mar 2005 11:35:23 -0600

Hi,

I've been experimenting with applying a very thin layer -- about the
thickness of a single piece of Scotch brand tape -- of
microcrystalline wax between two pieces of glass. I'm so far having
no luck.

I've tried the following methods:

Spacing the glass apart by placing small strips of tape between them,
and then wrapping the two with tape, I've submerged the entire setup
in melted wax. Problem: air gets trapped in the space between the
glass and at this thickness is near impossible to remove (without
resorting to a vacuum chamber, which I don't have).

Pouring a small bit of melted wax on one of the pieces of glass which
has tape at its edges acting as spacers, then placing the other piece
of glass ontop and applying even pressure. Problem: though both pieces
of glass have been pre-heated and cleaned repeatedly, subtle anomalies
and stratifications in the wax surface persist -- these are a mystery
to me and I'm at a loss as to how to better apply the wax.

Do any of you have advice as to what techniques I should use?
Essentially, I need to sandwich a very thin layer of wax between two
round (49mm dia) pieces of glass to act as a focusing screen for an
optical device, and so it must be free of bubbles and superficial
anomalies.

Thanks,

- jim

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