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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: 8,625

Hi, Bart,

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.

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,

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