Attention Tamron 24-70 VC owners

Started Jul 28, 2012 | Discussions thread
OP Horshack Veteran Member • Posts: 5,803
Re: Apparently the VC "jumpiness" is typical for Tamron

TAFB wrote:

Looks like you have a bad copy. As for the aperture issue, what tool are you using to measure brightness/EV between the f/2.8 photo and the f/4.0 photo? I have LR4.

I used ACR 6.7/CS5. In LR4 the exposure slider was changed from LR3; I've read it's no longer a straight exposure adjustment (across the full tonal range) but instead a targeted adjustment for only part of the tone curve. It doesn't really matter though - the exposure difference is pretty obvious to the eye. So you tried the experiment and see the expected exposure difference between f/2.8 and f/4.0?

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