Re: New Pinhole Camera Decision...

Good to see some activity on the list again. I have a
technical question I was hoping someone might be able
to answer.

I have an idea for a photographic project that will
require exposing two negatives of the same subject,
one with a lens camera and one with a pinhole (or zone
plate) camera. I want the two images to be roughly of
the same size so that one can easily be superimposed
on the other. Given information such as camera-subject
distance, focal length (for the lens camera),
pinhole-to-film distance, etc. Is there any simple way
to calculate how to create images of equal sizes on
the film using these two very different cameras?

I suspect that the question may not be clear. An
example might help: My pinhole cameras generally are
very wide angle, but my lens cameras are not (usually
a 50mm lens on a 35mm SLR, an 80mm lens on a 6x4.5
medium format camera, or a 200mm lens on a 4x5 view
camera). Say I'm in a studio setting. I want to take a
picture of a reclining figure with my 4x5 camera from
Zernike using two frames, making it 50mm from
pinhole/zone plate to film. I take a picture. Now, I
want to take another picture of the same subject with
my 4x5 view camera so that the two fiimages of the
figure are the same size on the film. With the lens
camera I can see how big the figure is. With the
pinhole camera, I can't. I guess what I'm asking is
this: given the specs of a pinhole camera, can you
easily calculate the size of the image of the subject
formed on the film?

Hope this makes sense

Thanks

Colin
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Received on Thu Dec 28 22:47:47 2006