I posted this in the Sigma 10-20 forum as well but I'm not sure if it's a lens or camera problem. I don't know it to be lens specific, although I have only noticed it using the mentioned lens. Recently I began noticing crazy overexposures when shooting at small apertures; the examples were shot at f16. This behavior isn't consistent. I have attached two images from a set of 15 photos I took Sunday, using identical settings on the lens and camera. The first 12 are so overexposed that I can't even recover the highlights, the last 3 are fairly well exposed. I am attaching the 12th and 15th of the series.
The attached images are all shot in with the K-7, RAW, Av Mode, ISO 100, Matrix Metering. The camera calculated a shutter speed of 1/80" for both images, which seems about right given the Sunny 16 rule but as you can see they are not even close.
Can anyone offer any suggestions?
Thanks in advance for any input.
OK, can't seem to get the images to attach...
Last edited by dhulsmeyer; 07-26-2010 at 05:40 PM.
Reason: added photos