This is not my lens and camera, it is a colleague of mine who can not afford the extra $$ for a Canon 16-35mm lens. When zoomed in as to remove the vignetting, which can be seen now through the viewing piece, the minimal wide aperture for no vignetting to occur, is 24-25mm. Now I personally find this amount of vignetting totally unacceptable as a wide angle lens. The amount of vignetting the lens exhibits is within the specification of the lens. When shot at widest aperture, most lenses will vignette. They have assess that the lens is working within specification. We have check the lens and sent sample images to Sigma Japan. I have now been informed that photos were taken using this lens and sent to Japan for inspection to see what and why this amount of vignetting has occurred with a compatible camera.Ī reply has come back only yesterday: Answer below I contacted the supplier, talked the problem over, sent many photos of proof and now at some expense the lens has been returned to place of purchase, within Australia (no grey import)Īll photos were sent by email, Feb and March shots. Sounds a lot but in time lapse as most of you know many photos are required to achieve this video. I now come to photo three, one month later, 10th March 2017 after the lens had taken only around 1500 photos. This is photo 1 photographed showing the properties of camera and lens. While the properties do not state the lens is Sigma, it shows f/1.8 which naturally is this lens in question. The second photo I photographed the properties of that shot proving the use of the 7D and the 19mm aperture. The first photo was taken on Feb 9th 2017 was at night for Astrophotography, and as you can see there is very minimal vignetting happening. I have serious concerns as to the performance of this lens as I have placed 4 photos for perusal and comment. The lens was used on the compatible 7D, as the 7D not being a full frame crop, was perfectly suitable and any vignetting which could occur, would be minimal as all wide angle lenses appear, as I have been informed! to produce some amount of this occuring. This lens was purchased for its wide aperture and f/1.8 chiefly to be used in Astrophotography/time lapse and any other situation that required wide angle. Sigma 18-35mm lens mounted on a Canon EOS 7D
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