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Photo Forum / Digital Photography / DSLR Cameras / September 2006The new Canon 50mm f/1.2L lens question
Is the new 50mm f/1.2L lens actually f/1.26, ie 1/3 stop faster than f/1.4 or is it f/1.19, ie 1/2 stop faster than f/1.4? It looks like it might be almost as expensive as a used 50mm F/1.0L which is a full stop faster than the f/1.4. > Is the new 50mm f/1.2L lens actually f/1.26, ie 1/3 stop faster than f/1.4 > or is it f/1.19, ie 1/2 stop faster than f/1.4? > > It looks like it might be almost as expensive as a used 50mm F/1.0L which is > a full stop faster than the f/1.4. Given that the human eye can't really detect differences smaller than 1/3 of a stop, I think that the possible 1/6 stop difference you question is pretty insignificant either way. The 1.0L was also a notoriously lousy performer, and the new lens is supposedly significantly better in that regard. Will > Given that the human eye can't really detect differences smaller than > 1/3 of a stop, I think that the possible 1/6 stop difference you > question is pretty insignificant either way. and 16% more or less shutter speed isn't normally going to save a picture either, but 1/6 stop is almost another 1/8" of very expensive clear aperture given that the glass usage probably goes up roughly with the cube of the diameter. Not a question of usefulness as much as getting your money's worth on glass or are they going to try sell it as f/1.2 and let many people think they are getting 1/2 stop faster but really only deliver 1/3 stop and save a bunch of cost. > The 1.0L was also a notoriously lousy performer, and the new lens is > supposedly significantly better in that regard. I have heard that it wasn't great although the Canon MTF charts and literature for it suggested it was a good lens. >Is the new 50mm f/1.2L lens actually f/1.26, ie 1/3 stop faster than f/1.4 >or is it f/1.19, ie 1/2 stop faster than f/1.4? > >It looks like it might be almost as expensive as a used 50mm F/1.0L which is >a full stop faster than the f/1.4. What makes you think it must be some simple fraction of an f-stop? There's no reason why a lens should not be f/1.2, f/1.21, or f/1.1905; modern metering and shutter speed controls can easily cope with such non-integral parameters. David  SignatureDavid Littlewood >Is the new 50mm f/1.2L lens actually f/1.26, ie 1/3 stop faster than f/1.4 >or is it f/1.19, ie 1/2 stop faster than f/1.4? > >It looks like it might be almost as expensive as a used 50mm F/1.0L which is >a full stop faster than the f/1.4. You haven't bought a used f/1.0 lately. If you can get one for double the 1600 dollar price Canon's is asking for the 1.2L you got a super deal. I know I just bought one in perfect condition for a low light project. > Is the new 50mm f/1.2L lens actually f/1.26, ie 1/3 stop faster than f/1.4 > or is it f/1.19, ie 1/2 stop faster than f/1.4? The camera shows 1/3 stops as: f/1.0, f/1.1, f/1.2, f/1.4, f/1.6, f/1.8, f/2.0, ... http://digitcamera.tripod.com/#slr >> Is the new 50mm f/1.2L lens actually f/1.26, ie 1/3 stop faster than f/1.4 >> or is it f/1.19, ie 1/2 stop faster than f/1.4? These ultrafast lenses vignette so badly that it hardly matters! Doug McDonald |
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