D90 w/ 2 copies of Tamron 70-300 - different exposures

Started Jun 29, 2012 | Discussions thread
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D90 w/ 2 copies of Tamron 70-300 - different exposures
Jun 29, 2012

Hi everyone! Yesterday, I compared a Tamrom 70-300 that I rented from lensrentals.com and another copy of the same lens that I borrowed from a friend (to determine whether to rent this specific lens). I shot in aperture mode. The rental lens consistently exposed with a faster shutter speed, resulting in underexposed pictures (not only relative to the other copy, but also generally more underexposed than I wanted). Is there a reason why this is happening? Is it because of the lens or the body? I'm heading on my trip tomorrow and don't want to have to deal with a funky copy!

Thanks!

Nikon D90
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