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Old 13th January 2009, 02:41 PM
Dave miller Dave miller is offline
Join Date: Aug 2008
Posts: 6,322

Originally Posted by kennethcooke View Post
I read that the above is useful for landscape work with black and white. I gather it is a Blue/ Green filter. What would be the nearest to a 44A and should I be able to acquire one in a 39mm screw thread? I also read that it gives black and white film orthochromatic qualities
You must first consider what effect you want the filter to have. In monochrome work filters lighten their own colour and darken opposite. In landscape work we usually use green to lighten foliage, however rarely would we also want to lighten a blue sky. So it is more usual to use a yellow/green filter which lightens foliage and at the same time darkens the sky.
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