A camera lens has a focal length of 180.0 mm and an aperture diameter of 16.36 mm.
Question:
(a) What is the I-number of the lens?
(b) If the correct exposure of a certain scene is 1/30S at f/11, what is the correct exposure at f/2.8?
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IDENTIFY The fnumber of a lens is the ratio of its focal length to it...View the full answer
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Related Book For 
College Physics
ISBN: 978-0495113690
7th Edition
Authors: Raymond A. Serway, Jerry S. Faughn, Chris Vuille, Charles A. Bennett
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