Re: [photo-3d] RE: Depth ranges

["David W. Kesner" <drdave@xxxxxxxxxx>]

Paul Talbot writes:

> BTW, it sounds like you are saying you move the camera so
> that the near object is in critical focus.  Don't you have
> some flexibility to move the camera forward or back of that
> point and let the depth of field make the subject acceptably
> sharp instead of dead-on in focus?

Yes, I can move the whole unit to place the focus where I 
want. Of course at these magnifications we are talking about a 
fairly small depth of field even with an fstop of 32-90.

> I don't fully understand how the magnification works on your
> camera,

Like any other macro bellows set up - by moving the lens 
further or close to the camera on the bellows.

> But to calculate an answer, you need to know with certainty
> the near point distance.  So far you have only stated a general
> number (less than 12 inches).

That is because I am confused on where the actual measurment 
is taken from: is it the film plane, the exit pupil of the 
lens, etc.? I assume if the film plane then it should include 
the full light path through all the mirror bouncing?

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx


 

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