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There is a Sears 135mm f/2.8 multi-coated lens for sale at a thrift store near me. I've been thinking of getting it for $10 on Monday when I go back over there.
I am curious about the low light performance of the lens. Is it identical to my 50mm when set to f/2.8 aperture? I'm speaking strictly about how much light the lens gathers, taking focal length and camera shake out of the equation (I know in reality I'll need to shoot faster shutter speeds for the 135mm compared to the 50mm).