The manual focus is fine. Other auto zoom lenses are working ont he camera (Sony a700) This Sigma just stopped. I wonder if it is something simple like cleaning the contacts on the lens. I assume I could take alchol to them, but maybe not...any suggestions?
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Could be, because most camera's only can auto focus till f/1:5.6. And if 5.6 is reached at the focal length of 200 mm, the camera stops it from going to a part it can't be focused.
Perhaps you try the lens in manual focus, and manual zoom.
Usually the gears will strip the lens gears which tend to be plastics whereas Sony a cameras themselves have metal driven cogs....I once stripped a sigma zoom using an
A700 simply because the motor on that camera had no feedback on torque...put a different lens to check this out first...then check the faulty lens the cog is visible once you remove the rear mount.
You can also get a 1.4 or 2x teleconverter to further increase the power of a telephoto lens. However, the cameras are unable to auto-focus when the minimum f-stop exceeds f/8, which can happen when you use one (or both) of the teleconverters on these longer lenses, so you have to manually focus the lens.
You can also get telephoto lenses from other manufacturers such as Tamron and Sigma that are built to work with Canon cameras. However, the Canon lenses are generally regarded as the best quality.
Did it ever work on this camera?
I have seen some Sigma lenses that are auto focus on canon film cameras but then when put on the digital they dont work right. If you have used it on this camera then make sure the lens is clean.sometimes dirt on the front wil make it try focusing on the dirt. Next try focusing in manual focus to make sure the focus is working. Then take the lens off and then put it back on and make sure it clicks into place.
Let me know if none of those things work. also make sure to try focus on something close and somthing far away.