>From most of the information I have seen DOF is fix formulated, only related
to focal length, COC and focusing distance. The Dr. mentioned the Super
Zeiss (250/5.6 APO?) has extremely high resolution, but it only do when
focus is extremely accurate. He seems has reduced the COC for this lens
(when comparied to another Zeiss of same focal length) so he said the DOF
is different for this lens and from this point of view not all the lenses
has the same DOF, it seems confusing or may by I was misunderstood.
C.H.Ling
----- Original Message -----
From: "Bill Pearce" <bspearce@xxxxxxxxxxxxx>
> "I don't know who Dr Kornelius J. Fleischer is, or what his credentials
> are, but I wonder how accurate his post is. "
>
> Dr. Fleischer is an employee of Zeiss, and occasionally posts to either
> Photo.net or the Hasselblad list (cant remember which or both), and is
> highly regarded. His posts are highly detailed, and seem authoritative.
The
> granting of Dr. is different in Europe than in the US, but would expect
> that he is an engineer or designer or something like that.
>
> He does, of course, have access to many great lenses, by right of his
> employment. Someone that has this source will tend to be more obsessive
> about the finest details than someone that pays retail.
>
> Bill Pearce
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