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Fast lens??????
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<blockquote data-quote="STM" data-source="post: 325217" data-attributes="member: 12827"><p>The "f stop" of a lens is a ratio of the focal length of the lens to the diameter of the opening created by the aperture blades. Unlike the focal length, which is usually measured in mm, the f/stop does not have any units of measure. However, a 50mm lens at f/8 will allow the same amount of light (in lumens) to the film or sensor as would a 600mm lens at f/ 8.</p></blockquote><p></p>
[QUOTE="STM, post: 325217, member: 12827"] The "f stop" of a lens is a ratio of the focal length of the lens to the diameter of the opening created by the aperture blades. Unlike the focal length, which is usually measured in mm, the f/stop does not have any units of measure. However, a 50mm lens at f/8 will allow the same amount of light (in lumens) to the film or sensor as would a 600mm lens at f/ 8. [/QUOTE]
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