I noticed that SD was changing as I zoomed in and out, while focus remained on the same, fixed, subject.
Quote from: barberofcivil on 19 / November / 2009, 23:24:06DoF field values should be calculate drelative to the optical centerNo .. to the anterior and posterior principal points .. which you do not know.You could determine them by experiment, they would change with every zoom position.For some cameras that would be over 120 different positions. Quotethis is can be easily correctable if the distance from the focal plane to lens front is known.SDM displays that information on one of its OSD's.Quote Finding this value or similar would help in correcting DoF calculations....It has been found for some cameras, check the SDM source code.The early versions of SDM had extensive DOF-based data on the OSD's.I deleted the lot.Why ?Because the camera cannot measure distance accurately, so the whole excercise is a waste of time.
DoF field values should be calculate drelative to the optical center
this is can be easily correctable if the distance from the focal plane to lens front is known.
Finding this value or similar would help in correcting DoF calculations.
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