Archived posting to the Leica Users Group, 1998/03/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> I'd just like to know which has a more narrow or shorter dof: > > 50/1.0 at f1.0 or a 90/2.0 at f2.0, distances we are talking about is > roughly 5 feet, 10 feet and 15 feet. According to the Depth-of-Field Calculator at http://ue3.ee.nus.sg/DOF.html 50 mm at f/1.0, the dof is: At 5 ft: 4.913164187472378 ft. to 5.089960530844127 ft. At 10 ft: 9.65299208454649 ft. to 10.372886853392671 ft. At 15 ft: 14.228497634361796 ft. to 15.859964297637054 ft. 90 mm at f/2, the dof is: At 5 ft: 4.9474890865032055 ft. to 5.053637535899924 ft. At 10 ft: 9.78575110745119 ft. to 10.223840404294359 ft. At 15 ft: 14.51836372390707 ft. to 15.514688638662639 ft. 85 mm at f/1.4 (because I'm curious), the dof is: At 5 ft: 4.958554452189829 ft. to 5.042144223990296 ft. At 10 ft: 9.83080299300112 ft. to 10.175123066748958 ft. At 15 ft: 14.618979472716822 ft. to 15.40141342808694 ft. As I've said before, I don't know how accurate the calculator is, but it's kind of fun to play with. Larry