I have a sigma 17-50 2.8 dc hsm lens just 3 month ago. there is a problem of two or three non focus images when taking around 15 to 20 images. Can it correct?
Yes, you can correct its focusing adjustment with Sigma lens dock. Please look it up at amazon/B&H or your local Sigma dealer
SOURCE: dust inside my sigma lens
Zoom lenses are kind of like a tire pump. They will draw air in (and out) when zoomed. The longer the throw of the zoom, the more air moved. You can try Sigma, they may cover it, but...
A small amount of dust should have no effect on the quality of your images, but I would be concerned about it being transferred to your camera's image sensor over time. ( I assume you are using the lens on a digital body )
SOURCE: focusing speed of sigma 18-200 OS HSM
As with most nikons the brighter the faster the af will work
SOURCE: will the sigma 120-400 os hsm auto focus on the nikon D-80?
Yes its a HMS lens it will work on most Nikons
SOURCE: My Sigma APO 70-200mm f/2.8 HSM lens functions
Am having the same problem. I fixed it once but can't remember how I did it. I think there are screws under the mounting ring -which has four screws itself. Then, I think under the green computer board, there are other screws that should be tightened... I will look at mine tomorrow and come back here to report.
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