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11-27-2011, 02:07 PM   #1
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Tamron 28-75mm and over exposure?

I just got my early "christmas present", the Tamron 28-75mm F2.8 lens. I have only taken under 100 photos with it but I already noticed some strange behaviour. I took some indoors pics and I got several that were significantly over exposed. For example, two shots taken only seconds apart in the same room (same lighting that is) using aperture priority had shutter speeds of 1/30 (correct exposure) and 1/13 (over exposed). My camera body is a K-x and I have not seen this happen with my other lenses (DA35, kit lens and tamron 70-300mm). Could this be a problem with the lens? With my camera body? With both, meaning this particular combination of lens and body?

11-27-2011, 02:26 PM   #2
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Are the contacts clean? What metering mode is set? Is lighting contrasty, with patches of light and dark?
11-27-2011, 02:33 PM   #3
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QuoteOriginally posted by RioRico Quote
Are the contacts clean? What metering mode is set? Is lighting contrasty, with patches of light and dark?
I can't check the contacts right now (not at home and don't have the camera with me). Have to check that when I get home.

Lighting was generally poor (had to bump up the ISO) but quite even. This happened even when taking two consecutive pics of the same subject. I used the default metering mode (multi metering, meaning the average of the whole pic area I guess).
11-27-2011, 02:38 PM   #4
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Try using center weighted metering and see if it is more consistent.
With multi any change in any part of the scene can affect the overall balance.

11-27-2011, 02:51 PM   #5
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Any of the automated metering modes are very scene dependent.
Check the lighting of the whole scene and look into the mode that will best suit that particular scene.
11-27-2011, 03:04 PM   #6
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QuoteOriginally posted by MadMan Quote
I just got my early "christmas present", the Tamron 28-75mm F2.8 lens. I have only taken under 100 photos with it but I already noticed some strange behaviour. I took some indoors pics and I got several that were significantly over exposed. For example, two shots taken only seconds apart in the same room (same lighting that is) using aperture priority had shutter speeds of 1/30 (correct exposure) and 1/13 (over exposed). My camera body is a K-x and I have not seen this happen with my other lenses (DA35, kit lens and tamron 70-300mm). Could this be a problem with the lens? With my camera body? With both, meaning this particular combination of lens and body?
Did you change the zoom setting between shots? Metering mode and what you are actually metering can change drastically at different focal lengths.
11-27-2011, 03:33 PM   #7
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Thanks for the tips!

Just out of curiosity, could this even be a problem with the lens? Or is metering problem always something that's camera body related? I'm not sure how the TTL-metering actually works in these modern DSLRs.
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