[pure-silver] Re: Large Format Tilt

  • From: "Justin F. Knotzke" <jknotzke@xxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Tue, 4 Dec 2007 11:44:10 -0500

On 04/12/2007, Jim Brick <jim@xxxxxxxxx> wrote:
> There is no free lunch!

   You've never worked in consulting then. ;-)

   Ok.. this needs more explaining then.

   Take my Nikon F5. I own two lenses for it. A 50mm and a 17-35 zoom (great
lens BTW). The 50mm starts to resolve images at I believe just under a
meter. The 17-35 starts at .28m.

   The 50mm goes into infinity focus just after 3-4 meters. The 17-35 does
so after 1 meter.

   Take my pond scene. Place the camera at equivalent distance for each of
the lenses so that the image size is the same for both.

   My 50mm is going to have DOF issues from 1 meter to 4 meters. My 17-35 is
going to have DOF issues from .28mm to 1 meter. Clearly my 17-35 is going to
give me less DOF grief then the 50mm.  With the 17-35, I only have to worry
about getting everything in focus from .28m to 1 meter of the total subject
whereas the 50mm requires that I worry about everything from 1 meter to 5

   Does that make sense ?


Justin F. Knotzke

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