Attention Tamron 24-70 VC owners

Started Jul 28, 2012 | Discussions thread
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Horshack OP Veteran Member • Posts: 5,803
Re: Problem #2: Aperture lever miscalibration

WildSammy wrote:

Sorry, I don't have this lens so I can't comment on the VC function, but the 1 stop EV difference could be present because of the vignetting wide open. I observe similar behaviour with my Nikkor 85G/1.8. When I stop down for example to f/4 the image is brighter compared when the lens was wide open. So it can be feature and not an issue Let others comment on this I will be interested too

I measured the brightness in the center of the frame, plus the DOF comparison I performed confirms that the aperture isn't properly stopping down between f/2.8 -> f/4.0

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