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Old July 4th, 2011, 04:46 AM
Doug Kerr Doug Kerr is offline
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Join Date: May 2006
Location: Alamogordo, New Mexico, USA
Posts: 8,558
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Hi, Bart,

Quote:
Originally Posted by Bart_van_der_Wolf View Post
Indeed, we photographers are faced with compromises imposed by physics. We use our knowledge of these compromises to optimise the solution.
Well said.

Quote:
Your example works fine, because the large negative you shoot on, needs relatively low magnification to produce a certain size output. A smaller film size would require more output magnification, e.g. a 36x24mm film frame needs 7-8x more magnification for the same output size. That means that it must be 7-8x sharper to give the same output resolution. Therefore f/64 must become f/8 and because we can use a shorter focal length for the same field of view, the DOF will be similar.
An important point, again well said.

Best regards,

Doug
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