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Broadway Bob

Milford, US
121 posts

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"RE: Standard f-Stops"

Broadway Bob Gold Member Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014warded for Nikonian since 15th Mar 2009
Thu 21-Mar-13 12:02 AM

Another factor to consider is the equation which includes the focal length of the lens: lens focal length/diameter of the aperture = f-stop. The f-stop number is a convenient way of describing the exposure settings rather than noting the area of the aperture. And, a given f-stop produces the same exposure regardless of the lens focal length (for a given shutter speed). For example, 1/500th of a second at f/5.6 on a 50mm lens gives the same exposure as those settings on a 300mm lens.

This becomes obvious if you think about an exposure meter - it only gives shutter speed and aperture regardless of the lens or camera type.


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A general, generic topic Standard f-Stops [View all] , dperry23 , Sun 10-Mar-13 03:24 AM
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