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09-24-2008, 11:29 AM   #1
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Tamron 17-50mm Under Exposing

I have had my Tamron 17-50mm f/2.8 XR for about a month and a half. Overall, I am happy with lens sharpness and build quality. Though I have noticed that with my K10D, the pictures using this lens are under exposed by about half to one stop. The underexposure is pretty consistent, though most evident outside with higher apertures. I have been setting the exposure compensation to +.5 (frequently, I am still needing to increase the exposure when I am processing the pictures on the computer). I am wondering if other people have had similar problems with this lens or lenses in general. Could I have a bad copy?

09-24-2008, 12:58 PM   #2
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I have same problem with this lens and i have to increase the exposure during PP. Otherwise i am happy with the lens performance. And i have read about this problem here and in dpreview.
09-24-2008, 02:21 PM   #3
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I have this lens and experience the same thing. Its a common "feature" of this lens. The other feature is that everything else about it is great.
09-24-2008, 03:36 PM   #4
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I've been meaning to buy this lens when I have the money, but if this is a feature in every copy, it makes me rethink..

09-24-2008, 04:44 PM   #5
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Correct me if I'm wrong, but this is due to light fall off. It's quite common in Tamron lenses, just that on 17-50mm is a bit more. It's still able to give great result.
09-24-2008, 08:18 PM   #6
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On the K20d body, my Tamron underexposes too, but only if I let the camera set the exposure--so I do not. I operate almost exclusively in the manual mode. If you shoot in the manual mode, and do not get the exposure you want, you only have yourself to blame.

If you shoot in other modes, then utilize the EV feature. The underexposure on the K20 is consistent. The lens is so good, that I have no complaints with its performance on the K20d, but I love the manual mode.
09-25-2008, 08:22 AM   #7
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There are 128 reviews here FM Reviews - AF 17-50mm F/2.8 XR Di II LD Aspherical [IF] by Canon and Nikon owners of the Tamron 17-50mm. Underexposure is not a consistent theme. If you want to learn more about the Tamron this is good resource.

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