01-14-2012, 10:07 PM
[quote name='BG_Home' timestamp='1326553225' post='14858']
I've seen this before with some of my lenses. In my case, a Sigma was about a stop or so darker than the equivalent Nikon. I guess that's the difference between f-stops and T-stops...
[/quote]
No, it isn't, actually. It may be a difference between aperture number reported to the metering system prior to closing down the aperture, and actual aperture when closed down, provided of course the lighting didn't change between taking the shot and metering. This because light is measured prior to taking the shot with any automatic aperture lenses, while the shot is taken with aperture close to the selected aperture number.
Kind regards, Wim
I've seen this before with some of my lenses. In my case, a Sigma was about a stop or so darker than the equivalent Nikon. I guess that's the difference between f-stops and T-stops...
[/quote]
No, it isn't, actually. It may be a difference between aperture number reported to the metering system prior to closing down the aperture, and actual aperture when closed down, provided of course the lighting didn't change between taking the shot and metering. This because light is measured prior to taking the shot with any automatic aperture lenses, while the shot is taken with aperture close to the selected aperture number.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....