[pure-silver] Re: Green vs Yellow filters
----- Original Message ----- From: <ATIPPETT@xxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, October 25, 2007 1:20 PM
Subject: [pure-silver] Green vs Yellow filters
I have been using a yellow filter (K2) for my landscape/outdoor black and white shots for some time. Recently it was suggestion that a switch to green (X1) would give me the same values in the sky and lighter tones with foliage. This all seems to make good sense and I plan to make some comparative prints. Is there any good references on a comparison of these two filters? 

Alan Tippett
San Jose, CA
An X-1 with most pan film is close to the eye's values for color rendition in B&W. Usually they are recommended for outdoor portraiture where one wants to darken the sky without making skin tones look washed out, which can happen with a yellow filter. An X-2 will bring up folliage a bit in daylight and gives proper gray scale values for color with tungsten light. Since a yellow filter passes green light the difference in folliage reproduction is only slight. For greater effect use a Wratten B filter or a No.61 filter. These are relatively narrow band filters selective for green light. Both have a fairly heavy filter factor. With a little practice you can usually get a good idea of what a filter is going to do by just looking through it. Keep in mind that most pan films have excessive blue sensitivity so the world looks bluer to them than to the eye. The tabular grain films like Kodak T-Max, Ilford Delta, and Fuji Acros, have more uniform spectral sensitivity, they see about like a standard pan film does with a K-1 or K-2 (No.8) filter. 

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Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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