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You have two options at the moment
A) USB dock firmware upgrade
B) sigma service centre repair if parts available
A home hatchet job on the lens NOT A HOPE yet as no one desperate enough yet to wreck their lens in the attempt
My advice sell the lens or the body and use the previous Nikon model that works
No. The Nikon F mount has a longer flange focal length than the Pentax K. What this means is that a lens adapter to fit a K mount lens onto a F mount body would have to have a negative thickness, which is a bit difficult to build with current technology. Adapters going the other way are possible and available.
Yes. Bear in mind that many Canon digital SLRs have a sensor smaller than a frame of 35mm film. This results in the image being cropped, narrowing the field of view and making the lens behave as if it was of a longer focal length.
If this is the Sigma 28-105mm f/2.8-4.0 as in the title, then the maximum aperture will vary with the focal length. It is probably only 2.8 when the focal length is zoomed to 28mm. It will be 4 at 105mm, and at focal lengths in between it will be in between.
The problem you are encountering is with the screw head interface between the lens and the camera body. They just are not locking together properly. Sounds like you need to send her in for repair.
Hi
Is the 28-70 a DF type if so it will work on a canon
DSLR but if its the older one with the scale ring is
on the outside of the lens it will need a rechip but I think thay are no longer avabile the 70-300 if is a super
it will work or need a rechip if its a older one with a macro switch held on the lens with 2 screws it to
old to up grade
If you don't know how to fix it yourself send it to Sigma UK (01707 329999). They are quite resonable charges for that sort of fault. Their website give a price guide depending on lens and fault. Steve
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