Nikon D70s Digital Camera "sigma auto focus working 28" Questions

...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 ...

Sigma 28-300mm f3.5-6.3 DL Aspherical IF Hyperzoom for Pentax SLR 28-30mm lens will work in manual mode but not auto focus. Keeps showing F- - and flashing white spot indicators. I believe the lens is

...sigma D nikon fit lens. In auto focus when you get to1.5 metre bottom focus it will not return to up focus . It will only up focus if you slightly turn focus ring back may be 1mm. It sounds as if the ...