SOS. Overexposure with 60-250

ginglesair · 08-09-2014, 03:17 PM

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?

**Ex Finn.** · 08-09-2014, 03:38 PM

Sounds like a sticky aperture mechanism. You are the first that I have heard of.

**jatrax** · 08-09-2014, 06:00 PM

Originally posted by Ex Finn.

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.

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

08-09-2014, 03:17 PM	#1
ginglesair New Member Join Date: Nov 2009 Location: Colorado Photos: Gallery \| Albums Posts: 24	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?

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08-09-2014, 03:38 PM	#2
Ex Finn. Site Supporter Join Date: Nov 2007 Location: Southern Maryland. Photos: Gallery \| Albums Posts: 7,857	Sounds like a sticky aperture mechanism. You are the first that I have heard of.

08-09-2014, 06:00 PM	#3
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,552	Originally posted by Ex Finn. 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. Check: Metering is not set to spot Exposure compensation is set to zero

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