The zone of sharp focus is also extremely narrow at macro distances, even shooting with f22 or f32! This is why flat field shooting is also easier. The 'depth' or 'width' of the zone of sharp focus may only be 2 or 3 mm at the most.

Cheers

Shaun

Mishka wrote:

i vaguely remember a discussion here some time ago, and i believe
the consensus was that "macro" lenses are optimized for close distances,
whereas "normal" lenses -- for infinity (or near-infinity, for macro purposes)

flatness of field is also an issue.

best,
mishka


On Fri, 12 Nov 2004 18:30:13 -0800, Shel Belinkoff
<[EMAIL PROTECTED]> wrote:


The macro gods have been very, very good to me, and I have a couple of fine
Pentax lenses.  While preparing to do a close-up of a three dimensional
object the thought crossed my mind that a macro lens is best suited for
flat objects, like stamps and documents, rather than something with greater
depth like the small toy car I was photographing.  Using the A100/2.8 macro
and the K105/2.8 on the same subject, there didn't seem to be any
observable difference between the two photos.

So, what do the macro and close-up gurus have to say about this?  Under
what circumstances would a macro lens be the better choice, and when might
an ordinary lens be a better option?


Shel









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