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#1 |
Senior Member
Join Date: Jun 2006
Posts: 820
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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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#2 |
Member
Join Date: Aug 2006
Posts: 94
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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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#3 |
Senior Member
Join Date: Mar 2006
Location: Pensacola, Florida
Posts: 3,589
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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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