[pure-silver] Re: Weak Blacks
----- Original Message ----- From: "Eric Neilsen Photography" <ej@xxxxxxxxxxxxxxxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, January 28, 2009 5:59 PM
Subject: [pure-silver] Re: Weak Blacks
Elias, Things fade, get damaged and worst of all, the formulas change and the filter packs get redone. You may have handled your gels very nicely over the years, but I have seen at least three different sets of filters over the years. I am not just saying seen three, but three different colors sets/ranges that don't include a CC set for color printing.
You might also try only diluting the Sprint to 1:4 or so instead of 1:9. that may just give you enough pop without building up too much fog. I did 
that in the past with Sprint without any problem.

Eric

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
www.ericneilsenphotography.com

SKYPE   ejprinter

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Elias Roustom 
Sent: Wednesday, January 28, 2009 7:12 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Weak Blacks
My Durst M605 has an additional filter (besides the YMC) that is supposed to add a level of contrast beyond normal range. I have not 
given that a try.
I thought dichoric filters weren't supposed to go bad.

Elias
If the dichroic filters are made by vacuum depositing a metalic oxide on the glass they should not fade, The layer is similar to a lens coating. Gelatin filters almost invariably use dyes of some variety. Dyes are all fugitive to some extent, some being much more stable than others. Kodak used to indicate the stability of the dyes it used in Wratten filters but I don't think any variable contrast filter make does so. Some ilford filters are made of a plastic rather than gelatin and some are waterproof. I am not sure which. Gelatin filters have an advantage when they are used in the image path but not when used in the light path. Filters used between lens and image or between lens and negative should be as thin and as high quality as possible. Filters used in the light path are much less critical of requirments. Variable contrast filter sets _should_ be replaced periodically because they do change transmission characteristics. The difference may not be visible by eye but can still affect the contrast and exposure produced with the filter. Some early color head lamp-houses, notably the Omega, used filters colored with dyes rather than dichroic filters. These filters are subject to intense light and are very short lived: they should be replaced frequently. AFAIK, metal film dichroic filters should be very long lived. 

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your 
account (the same e-mail address and password you set-up when you subscribed,) 
and unsubscribe from there.

Other related posts: