Luminous Landscape Forum
Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: Edalongthepacific on July 15, 2012, 10:05:40 pm
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What is a fast lens? I would say any lens between f/1.2 and f/2.8. Agree?
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But why rule out anything "faster" than f1.2?
How about... faster = faster than f2.8?
:D
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Well, I guess I was thinking that for all practical purposes an f/1 lens was unavailable. Can an f/1 lens be made and priced within reasonable limits? I have heard that there are lenses faster than f/1 but how can that be?
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I think the fastest lens ever is the Zeiss 50mm f/0.70, used for Barry Lyndon by Stanley Kubrick.
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Well, I guess I was thinking that for all practical purposes an f/1 lens was unavailable. Can an f/1 lens be made and priced within reasonable limits? I have heard that there are lenses faster than f/1 but how can that be?
Well I have a Voightlander 25mm f0.95 and it is currently available in Micro 43 mount. Great lens - you will find a review of it somewhere on LL. They have also just released a 17mm lens also f0.95. (these are equivalent to 50mm and 35mm in full frame).
Jim
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I think the fastest lens ever is the Zeiss 50mm f/0.70, used for Barry Lyndon by Stanley Kubrick.
… and for shots of the dark side of the moon. Cue Pink Floyd. ;D
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Hi,
F-stop is aperture divided by focal length. Increasing the opening of the lens so it is larger than the focal length will make for F-stop < 1.
I'm not sure there is a theoretical limit, although it may do with total reflection at certain angles, but that would only occour on glass air surfaces, I think.
Best regards
Erik
Well, I guess I was thinking that for all practical purposes an f/1 lens was unavailable. Can an f/1 lens be made and priced within reasonable limits? I have heard that there are lenses faster than f/1 but how can that be?