> My print frame has a scratch in the center (of course). Any suggestions
> for getting rid of the scratch short of replacing the glass?
Not really. I suppose you could try nose grease :*) But seriously,
thinking about the problem it would seem that minimizing the scratch
would depend on:
* The depth of the scratch
* The location of the scratch (lamp side / neg-print side)
* The edges (or surface if you will) of the scratch
A scratch "prints" out because the light passing through the scratch
is refracted at different angles than the area surrounding it.
Additionally, and I am speculating a bit here, there might be some
reflection across the internal surfaces of the scratch. Filling the
scratch with some substance like a hard wax or clear resin would
mitigate the effects from both refraction and reflection to some
degree; possibly even "eliminating" the problem if the scratch is on
the lamp side of the glass.
You might try asking your question in the USENET news groups sci.astro
and/or sci.astro.amateur. I have found people "there" to be most
helpful with regards to questions about glass, mirrors and optics.
Good luck.
-greg schmitz
----------
"Society is composed of persons who cannot design, build, repair, or
even operate most of the devices upon which their lives depend. In
this sense, specialists of various stripes are left to trade on each
other's ignorance.
-Langdon Winner
AUTONOMOUS TECHNOLOGY (MIT 1977)
----------