Depends on what you want to do. A red filter will deepen the blues and lighten 
the reds. Think of it as absorbing the red light, or whatever the color of the 
filter might be. A green filter will lighten foliage and deepen the warmer 
tones a bit. It works nicely with people who are overly pale. Sometimes. A 
yellow will deepen the blues a bit but not as much as the red filter. Sometimes 
trial and error is the only way to gauge the overall effect. I use those 
filters from time to time. They work well.
Paul
 -------------- Original message ----------------------
From: "David J Brooks" <[EMAIL PROTECTED]>
> I have started to play with these filters, found on Mark Roberts site,
> and am happy for the most part, but find my self having to go through
> each one to see the effect.
> 
> I have some, but not a lot of usage with B&W film  over the years, but
> not filters. I know the film "see's" colours as different shades, but
> i'm
> wondering if there is a good start point. Like if the photo has a lot
> of red in it, do you start with a red filter, or blue.
> 
> Any tips to start.
> 
> Dave
> 
> -- 
> Equine Photography
> www.caughtinmotion.com
> http://brooksinthecountry.blogspot.com/
> Ontario Canada
> 
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