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08-09-2014, 03:17 PM   #1
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SOS. Overexposure with 60-250

Ok here is the scoop. I rented the DA 60-250 this week for local airshow. I thought I would give it a try. My usual lens that I use is the Sigma 60-200 2.8 and I have never had this issue. The 60-250 is dramatically overexposing some of the images. I tried everything to try and get it to stop. Shooting in manual, Av, Tv, using the exposure compensation to dial it down and changing the metering. Nothing worked. Now it was not doing this on every shot but I can't narrow it down yet as to exactly when it was doing it. Anyone else have similar issues before?

08-09-2014, 03:38 PM   #2
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Sounds like a sticky aperture mechanism. You are the first that I have heard of.
08-09-2014, 06:00 PM   #3
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QuoteOriginally posted by Ex Finn. Quote
Sounds like a sticky aperture mechanism. You are the first that I have heard of.
Agree. Quick test is to dismount the lens look at it from the rear. Move the aperture lever so that the aperture blades are fully opened, now let go. The aperture blades should snap back closed. No hesitation, no slow movement, just spring loaded SNAP. If there is any hesitation then that is the problem. If not, then I'm stumped, you seem to have tested the other possibilities.

Metering is not set to spot
Exposure compensation is set to zero

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