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AhamB
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Re: Rokinon 85/1.4


gpop wrote:
>> it appears a lot of Canons don\'t meter correctly unless you manually stop down the lens with the DOF preview button.<<

I don\'t understand this comment, or does the DOF preview button have a function I\'m not aware of for a manual aperture lens?

my (limited) experience suggests to me that canon cooks the metering with oem ef glass, as I think all my non-oem meter poorly from 1.4-2.8, give or take.
I\'ve only tried this with a few fast EF primes, but if I twist the lens a bit so the contacts don\'t mesh, I\'ll get different metering by at least 1/2 stop.


No, the remark about the DOF preview button is misinformed, I believe. It doesn\'t do anything when using an alt lens, with chipped adapter or unchipped.

Fast EF primes do some exposure correction (increasing ISO covertly) for losses that occur at the sensor. See this article: http://www.luminous-landscape.com/essays/an_open_letter_to_the_major_camera_manufacturers.shtml



Nov 02, 2011 at 02:02 PM





  Previous versions of AhamB's message #10051556 « Rokinon 85/1.4 »