P3D Re: Graflex Stereo

[Stereoptician <stereoptician@xxxxxxxxxxxxxxxx>]

Tom Hubin wrote:

> Too much light is easily remedied. If you need 1/9 as much light then
> make an aperture for the lens with 1/3 the diameter of the present lens
> aperture. That will limit your light intake amd increase your depth of
> field. That may also sharpen some of the fuzzy images mentioned if the
> cause is a poorly corrected lens.

If you add such an aperture out in front of the lens, like a filter, you
will actually increase the lens abberrations, and may cause focus shift.
The longitudinal position of the aperture is chosen by the lens designer
to optimize performance.  Assuming that the designer did a good job, the
proper place for the aperture is between the elements, where the existing
aperture is.

Further discussion, if any, should probably go to tech-3d.

Stereoptician


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