What do you think of this DOF article?

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RichA - 01 Apr 2006 06:53 GMT

I inquired about the lack of hyperfocal marks on modern Olympus lenses
on another group.
Someone pointed out this article.

http://www.trenholm.org/hmmerk/DOFR.html

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Alan Browne - 02 Apr 2006 20:00 GMT

> I inquired about the lack of hyperfocal marks on modern Olympus lenses
> on another group.
> Someone pointed out this article.
>
> http://www.trenholm.org/hmmerk/DOFR.html

A bit erroneous (the lens / film resolution part) and substantially
incomplete:

DOF calculation primarily relates to the size at which the image will be
printed from a given film format. DOF markings on lenses are typically
for an 8x10 - 8x12 print. They are meaningless for a 4x6 print (more
DOF) and for a 16 x 24 print (less DOF).

For that matter, a 1.6x cropped sensor using FF lenses and their
markings will produce less DOF than the marking indicates when blown up
to the "typical" reference size.

Alan

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