Archived posting to the Leica Users Group, 1997/10/08

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Subject: Re: OFF-TOPIC; Blue filter enlarging stuff
From: Joe Berenbaum <joe-b@dircon.co.uk>
Date: Thu, 9 Oct 1997 03:07:06 +0100 (BST)

At 17:42 08/10/97 -0400, you wrote:
>>Unfortunately modern VC papers respond well to much shorter wavelenghts of
>>light, down into the near UV where the human eye sees almost nothing. As a
>>result, even when we focus our enlargers through a deep blue filter, we're
>>using a diffeent part of the spectrum than the print paper sees. The print
>>paperresponds to light outside the normal spectral range for which the
>>lens is optically corrected.
>
>THis may be a stupid question, but what would happen if you put a UV 
>filter on your enlarger lens, or put it between the neg and the light 
>source?
>- Paul

That wasn't me, it was quoted from the text of Ctein's article in Darkroom
User. But I don't think it's a stupid question, I also wondered why no-one
had (apparently) tried that. There was a brief reference to this matter in a
thread on rec.photo.darkroom that mentioned a lot of people doing a lot of
testing after that article came out, and most finding they didn't have a
problem. If I find I have a problem (my darkroom is just about ready to use,
give or take something to put my Nova pod on) I will try a UV filter. I
don't suppose there is a darkroom email list anywhere on the net?...

Joe Berenbaum