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Old Aug 31, 2006, 11:18 PM   #1
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Hey all, at first when I heard the term fast lens I assumed it meant shutter speed. However, I have now learned that shutter speed is based on the body, not the lens.

So I have gathered that a fast lens has a wide aperature... why is this considered fast where as narrow aperatures are slow? Does it still refer to shutter speed because you can use faster speeds with a wide aperature.
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Old Sep 1, 2006, 12:04 AM   #2
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youre pretty much right:-).I think a wide aperture is called a fast one because it lets in more light therefore resulting in a faster shutter spped:lol:.
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Old Sep 1, 2006, 12:12 AM   #3
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Morag2,

I have been using slr cameras since 1971, and have a number of prime lenses of between f1.4 and f2, and although I have always referred to them as fast lenses, I suppose you could also refer to them as bright, as opposed to a lens with a max aperture of,say f4. When looking through the viewfinder, the bright lens will give you a brighter view than the f4 lens at wide open aperture.

Back before open- aperture metering came along, all metering had to be done at the working aoerture. Imagine trying to focus on something at f16. We have truly come a long way...

Cheers,

Robert
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