Re: Binocular-Photo camera

In article <C02A0BAC.35447%arthur.rau@xxxxxxxxx>,
Arthur Rau <arthur.rau@xxxxxxxxx> wrote:
Thank you for this, but how do you calculate the magnification for my camera
(6X). I know for my binoculars because it is marked on it (10X). What is the
report between my 400 mm lens and your result.

If you want something which works as a magnification figure, start off
with a normal-range zoom lens attached to the camera, keep one eye
open and one to the viewfinder, and find the focal length at which
objects look the same size in each eye. This is rather dependent on
the camera: for the Olympus E10 I have lying around it's about 90mm,
for some of the 35mm film cameras I've used it's about 50mm.

Then divide the focal length of the lens you're using by this measured
figure and you get something like a magnification figure.

The interesting exercise, which works best with small digital cameras,
is to have the camera look through the binoculars; this applies the
10x magnification of the binoculars to the focal length of the camera,
and in bright sunlight you can get hold the apparatus still enough to
get some quite impressive shots -- I have a nice video of a helicopter
releasing flares taken that way at an airshow.

Works best with compact digital cameras because you need the output
pupil of the binoculars (=lens diameter / magnification, 4.2mm in your
case) to be about the same size as the input pupil of the camera
(=focal length / aperture); digital cameras tend to have focal lengths
around 10mm.

Tom
.

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