"____" <internetphobic@[EMAIL PROTECTED]
> wrote in message
news:internetphobic-293A06.22372719032008@[EMAIL PROTECTED]
> In article <13u3gs3qnrtup2a@[EMAIL PROTECTED]
>, <jjs>
> wrote:
>
>> > Yes, as long as it is an anti-newton negative carrier.
>>
>> I'm glad that was brought up. Quite frankly, I just
>> presumed the negative
>> carrier in question would need anti-newton glass. I will
>> describe it and
>> perhaps someone can enlighten me. The glass is for the
>> Saltzman 8x10
>> enlarger. The carrier works with two plates of glass
>> (exactly 8x10") to
>> sandwich the negative. There is nothing whatsoever to
>> separate the gl*****,
>> except the negative. One removes the lower glass, does
>> what he can to remove
>> dust, replaces the glass, and swings four tension clips
>> over the edges of
>> the glass.
>>
>> Requires AN glass, no?
>>
>> Thank you all!
>
> 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.
>
Newton's rings are most obvious where the light source
is collimated which is at least partially the sase when a
condenser source is used. A diffusion source will not
usually display the rings.
Most condenser enlarger lamphouses are somewhere between
diffuse and a true specular source which requires a point
source as well as a means of collimation. The typical
enlarging lamp is a fairly large and quite diffuse source
(for instance an opal lamp) so the resulting light is
partially diffuse and partly collimated.
Saltzman also made a glassless negative carrier that
held the negative flat by spring tension by means of clips
on the carrier.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]
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