by Chris H <chris@[EMAIL PROTECTED]
>
May 9, 2008 at 07:18 AM
In message <kPKUj.31954$KJ1.4497@[EMAIL PROTECTED]
>, Bruce <null@[EMAIL PROTECTED]
>
writes
>I've got a question about infrared focus compensation. I have a Nikon
>80-400m zoom lens and in the do***entation for that lens Nikon states:
>"When shooting black and white with infrared film, it is necessary to
make
>slight manual compensation to the focused distance. With color infrared
>film , no compensation in focus is needed."
>
>So my question is why could there be a difference in the focus
compensation
>between B&W and color film? After all focus is focus.
Focus is focus but you are focusing something different. Can you focus
the TV signal on the camera?
Radio, Tv, sound and light are all the same thing at very different
frequencies. IR, UV and Visible light are all very similar but
different.
Also the way the film reacts to the waves will be different depending on
chemical makeup
On my 35mm SLR there was a red mark just offset from the normal focusing
mark for IR film. The manual may tell you where the one for your lens
is.
--
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\/\/\/\/\ Chris Hills Staffs England /\/\/\/\/
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