01-12-2012, 09:29 AM
[quote name='Frank' timestamp='1326357905' post='14795']
I am curious. Can overexpose happen to a lens when the lens is wide open?
Frank
[/quote]
Not normally. Only if something is wrong with the lightmetering system, or when the lens reports something to the camera it shouldn't.
Having said that, overexposure can occur for other reasons. For one there is the fact that the metering system in camera only guesses at whatever it thinks is correct, and circumstances and metering mode may cause overexposure (or underexposure) indeed. It really is up to the photographer to judge the circumstances correctly, and adjust the exposure accordingly. Do note that the metering system is based on average settings for exposure - it treats the metered parts on average as a scene with 18% reflection. If it is in fact a very bright scene, it will therefore underexpose, relatively speaking, and when it is a very dark scene, it will overexpose, relatively speaking. It will try to bring everything back to this 18% average.
F.e., shooting a large, bright sky without any adjustments will result in underexposure of everything that is not sky, generally speaking, and similarly, when shooting a nightscape, everything will be overexposed and look as if it is day when one leaves it to the metering system. In short, one should use one's discretion in correcting exposure to obtain the exposre one desires or aims at. But that is nothing new, this was valid with film as well <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.
Kind regards, Wim
I am curious. Can overexpose happen to a lens when the lens is wide open?
Frank
[/quote]
Not normally. Only if something is wrong with the lightmetering system, or when the lens reports something to the camera it shouldn't.
Having said that, overexposure can occur for other reasons. For one there is the fact that the metering system in camera only guesses at whatever it thinks is correct, and circumstances and metering mode may cause overexposure (or underexposure) indeed. It really is up to the photographer to judge the circumstances correctly, and adjust the exposure accordingly. Do note that the metering system is based on average settings for exposure - it treats the metered parts on average as a scene with 18% reflection. If it is in fact a very bright scene, it will therefore underexpose, relatively speaking, and when it is a very dark scene, it will overexpose, relatively speaking. It will try to bring everything back to this 18% average.
F.e., shooting a large, bright sky without any adjustments will result in underexposure of everything that is not sky, generally speaking, and similarly, when shooting a nightscape, everything will be overexposed and look as if it is day when one leaves it to the metering system. In short, one should use one's discretion in correcting exposure to obtain the exposre one desires or aims at. But that is nothing new, this was valid with film as well <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.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 ....