Re: PHOTO-3D digest 1156

[egoldste@xxxxxxxxxx (Eric Goldstein)]

At 8:14 PM 2/4/96, bsharp@xxxxxxxxxxxxxxxxxxxxxx wrote:
>When using +1,+2, & +3 closeup lenses with the Two inner lenses of the
>Nishika Camera is there any way of knowing the camera to subject
>distances or is it simply by trial and error.  I wonder if there is any
>formula for the different closeup lenses.


There are formulas, but may a suggest a different method?

After placing the CU lenses on the camera, open the camera back, and then
open the shutter and aperture. By placing a piece of ground glass (or a
piece of wax paper) in the film channel on the film plane, you will be able
to focus your subject matter with ease, especially if you have a loupe or
hand magnifier. You can then stop down the aperture to get the DOF you
need, and handle exposure with shutter speed.

I suggest this method rather than a computational one for several reasons:
(a) It is more accurate.
(b) It allows you to compose your picture accurately.
(c) It clearly and obviously shows the effect of aperture on DOF, and helps
you get all that needs to be in focus, in focus!

BTW, best optical performance should be obtained with your camera lenses
set to infinity, which is where they are typically optimized. You would
focus by using different combinations of CU lenses, and adjusting the film
to subject distance.

Good luck!


Eric G.
egoldste@xxxxxx


Oh, Jeez, I've taken for granted that there is shutter control on the
Nishika... is there a "B" or "T" setting?



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