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| 04-15-2008, 05:53 PM | #31 |
 Originally posted by mattdm  (I'm interested to hear any tricks you might have, though.) H ~= 1730 a T(T = f/d is the "tele factor" being ~1 for a normal lens and ~4 for a 200mm/135mm crop tele) (d: sensor size in mm, f: focal length, a: aperture in mm = f/F, H: hyperfocal distance). 1730 reproduces the marks on Zeiss lenses. Example: 135mm tele at f/16: (a = 135mm/16 = ~8.5mm, T = 4 for APS-C) H ~= 1730 * 8.5mm * 4 = 59m But a fast guess would be 2000*10*4 = 80m which is good enough. | |
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