Re: [photo-3d] depth of field

["Allan Griffin" <agriffin@xxxxxxxxxx>]

Mike, all my experience teaches me that ANY lens of a given focal length
produces the same depth-of-field characteristics for a given f. stop.
Variations in the actual scale on specific lenses would appear to be
different interpretations of exactly where the "acceptable degree of sharp
focus" drops off.  I expect we have Group members on this List who can quote
the theoretical basis for such calculations reference the "circle of
confusion" or other.  It would be profitable for you to actually conduct
your own comparison tests and set up your own "acceptable" DOF scale for any
of your cameras.

Allan
            ************************************
Sent: Tuesday, November 14, 2000 10:16 AM
Subject: [photo-3d] depth of field

Mike Galazin wrote:

> Can anyone tell me what factors govern a 35mm lens' depth of field?  Does
a
> greater DOF indicate a better quality lens, or one of a greater diameter,
or
> what?  I was trying to predict what my DOF would be with my Wirgin stereo,
> so I looked at my other cameras to see if they all run about the same.
They
> are similar, but far from identical in this regard.  I see that my Realist
> 3.5 at (for example) F8 will give good DOF from infinity to 9 feet; by
> comparison my FED B-O-Y at F8 is sharp from infinity to 10 feet; and my
> Realist 45 DOF at F8 extends from infinity to about 6.5 feet.  All of
these
> lenses are supposed to be 35mm.  So I'm wondering, does the greater DOF of
> the 45's Steinheil Munchen Cassars indicate better lens sharpness overall
> than the David Whites on my Stereo Realist?  If not, what is the reason
for
> this DOF variation?
>
> Best regards,
>
> Mike Galazin
>
>
>
>