Re: AN (Anti-Newton) glass question

In article <internetphobic-293A06.22372719032008@[EMAIL PROTECTED]
>,
____  <internetphobic@[EMAIL PROTECTED]
> wrote:
>
>Ok for you, I just pulled my Omega 10x10 carrier out of the enlarger 
>and it has two sheets of standard optical glass but not AN. To my 
>knowledge AN appears with a Matte surface unlike standard optical grade 
>glass. It (AN) will look less than perfectly clear. Imop & Perhaps 
>Richard K. can corroborate AN is only needed with a Condenser housing, I 
>have an Omega diffused Halogen one of three known to exist.

No.  Under some conditions -- atmospheric and of the negative -- you'll
see Newton rings with this glass carrier.  I know because I have one.

To make one of my negatives printable I had to replace the top glass in
my 10x10 Omega carrier with AN glass and the bottom glass with a piece
of anti-reflective coated glass from a frame shop.  With that done, the
problem was considerably lessened, though not eliminated entirely.

The best solution is a tension carrier like the pin-register carriers
Fotar used to make for their enlargers -- actually the only 8x10"
tension carriers I've ever seen.  In 4x5" the Beseler Negaflat, of
course, was fairly common.

-- 
  Thor Lancelot Simon	                                    
tls@[EMAIL PROTECTED]
  "The inconsistency is startling, though admittedly, if consistency is to
   be abandoned or transcended, there is no problem."	      - Noam Chomsky