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Re: Canon 50mm f/1.2L
Actually there should only be two 1/3-stop steps between f/1 and f/1.4, and those would be f/1.1 and f/1.3. Ditto for f/1.4 and f/2 (1.6, 1.8); f/2.8 and f/4 (3.2, 3.5); and f/4 and f/5.6 (4.5, 5.0). The math isn't hard; each one-stop difference is calculated by multiplying by 2 to the 1/2 power (the square root of 2 or… -
Re: Canon 50mm f/1.2L
The only confusing thing about all this is that there are the exact (mathematical) fstop numbers and the "rounded" fstop numbers. The mathematical values are needed for example when creating your hyperfocal distance chart. Those values can easily be derived by looking the area of the aperature and dividing it by 2 to reach… -
Re: Canon 50mm f/1.2L
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Re: Canon 50mm f/1.2L
From the link: "f/stop Graph... The diameter and area values of each f/stop are based on a lens with a focal length of 50mm. Note that an f/stop value is the ratio of the focal length of the lens to the diameter of the aperture. Thus, f/1 has an aperture diameter of 50mm, f/2 a diameter of 25mm, f/8 a diameter of 6.25mm,… -
Re: Canon 50mm f/1.2L
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Re: Canon 50mm f/1.2L
It's correct, although somewhat inaccurate due to rounding errors. If we assume that there is a true half stop between the indicated aperture settings, opening up half a stop from f/1.4 to f/1.2 actually lets about 41% more light in, or put another way, we now have 141% of the light we originally had. Opening up another…
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