Re: Kodak And Hyperfocus(long)

[egoldste@xxxxxxxxxx (Eric Goldstein)]

At 8:52 PM 12/8/95, LDAEnt@xxxxxxx wrote:
> So I suspected that Kodak was using a different C of C.  The choice of C of
>C has a direct bearing on how sharp a photo will appear throughout its' depth
>of focus.


DOF is a frequent and important topic of discussion on this group, and it
seems we have just about all come to the same conclusion... Sharpness or
unsharpness is not discreet or absolute, and C of C criteria are
arbitrarily and capricously adapted by each manufacturer for reasons we are
clearly not meant to understand.  ;-)

For those of us who have difficulty enough remembering our telephone
numbers, much less the different between indicated DOF and acceptable DOF,
I can pass along a hint from one of my old Rollei camera manuals...

If the indicated DOF on your camera is giving you results you deem
unacceptably soft at the extremes, then stop down an additional stop
without shifting the lens focus. In other words, and for example, set your
focus (hyperfocus) as if you were using an aperture of f/8, and stop the
lens down to f/11 (adjusting shutter speed to maintain proper exposure of
course).

This will effectively knock-down the C of C from, say, f/1000 to f/1400, or
f/1400 to f/2000, and yield a notable and visible improvement in sharpness
at the extremes, without the need to consult DOF tables or remember a lot
of numbers.


Eric G.
egoldste@xxxxxx





------------------------------