Hello
I have an issue I recently noticed on my hiking vacation in the swiss alps. Some time ago I replaced my Canon EOS 20D with the new 550D... very happy so far. I kept both my lenses, one of them is the Sigma 18-50 / 1:2,8 / DC EX. I never had a problem with the 20D.
Now, when I take some pictures at excellent light conditions (very sunny!!), some pictures are completely overexposed. If you compare the 2 attached pictures, both are taken at the same time in automatic mode (P) with the Sigma lens:
Taken with: Canon EOS 550D and Sigma 18-50 / 1:2,8 / DC EX
overexposed picture: focal length: 38
exposure time: 1/640 sec
aperture: f/9
good picture: focal length: 50
exposure time: 1/640 sec
aperture: f/9
Exposure and aperture are the same, so I suspect an issue with the lens (some kind of partial incompatibility?).
Also I am pretty sure that I never noticed such a tremendous overexposure with my other lens (Canon 55-250 / 1:4-5,6 / IS).
Anybody has a more precise idea what is going on here ?
Thanks for any help
Domenico
I have an issue I recently noticed on my hiking vacation in the swiss alps. Some time ago I replaced my Canon EOS 20D with the new 550D... very happy so far. I kept both my lenses, one of them is the Sigma 18-50 / 1:2,8 / DC EX. I never had a problem with the 20D.
Now, when I take some pictures at excellent light conditions (very sunny!!), some pictures are completely overexposed. If you compare the 2 attached pictures, both are taken at the same time in automatic mode (P) with the Sigma lens:
Taken with: Canon EOS 550D and Sigma 18-50 / 1:2,8 / DC EX
overexposed picture: focal length: 38
exposure time: 1/640 sec
aperture: f/9
good picture: focal length: 50
exposure time: 1/640 sec
aperture: f/9
Exposure and aperture are the same, so I suspect an issue with the lens (some kind of partial incompatibility?).
Also I am pretty sure that I never noticed such a tremendous overexposure with my other lens (Canon 55-250 / 1:4-5,6 / IS).
Anybody has a more precise idea what is going on here ?
Thanks for any help
Domenico