Re: Film back
- From: Paul Geisler <paul.geisler@xxxxxx>
- Date: Fri, 10 Feb 2006 16:06:40 +0100
As for using a zoom lens, the actual distance of the lens (which consists of several ones..) is not truly the distance of it to the CCD.
But it sould anyway (i hope so) be possible to treat it as one single lens.
So if you shoot a 100m wide wall at 100m distance, a single lens with focal length 5mm at ~5mm distance to ccd would make a picture 5mm wide, forcing the CCD to be 5mm in width.
Knowing the exact CCD size, you could get the real focal length and vice versa. But if you don't thrust the lens scale inscriptions, you cannot verify them without having the exact CCD size.
If you do tests, allways shoot far away targets, as focussing near targets influences the distance between CCD and lens (or do not, as zoom optics are really strange things, and this "pumping"-error could be corrected by design).
hope this helps
Paul
.
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- From: G Hardy
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