And the AF stops working. The Light on the bottom left when I'm looking through the eye piece is flashing. It's not the camera body because my other lenses work ...

It turned out that the AF belt has weakened and they had replaced it. Now the AF works just fine on this lens. With 20/20 hindsight, it is apparent the AF belt ...

Personally, I've encountered auto focus problems with my Sigma AF105mm macro lens ever since I've had it. I find that sometimes AF is completely redundant in ...

Nov 19, 2019 · I cant stop the lens down - its works at 2.8 but no other appeture on Canon 7d Mkii or canon 60d - anyone know how to update the firmware and ...

The auto-focus speed is extremely slow, compared to Canon's USM. However, speed is decent if you set the focus limiter to either normal or macro range. I am ...

The manual focus ring is massive and takes up the whole front section of the lens. Manual focus adjustment feels extremely smooth. Sigma's HSM auto-focus is ...

Jan 1, 2010 · Hi, i am doing an autofocus algorithm for canon EOS camera by using the EOS SDK, but i dont know how to control the lens to move the focus ...

so i was looking at these converters: quantaray 2x af tele-converter, sigma 2x tele-converter ex apo, and the canon extender ef 2x II. in that order because of ...

Disabling the auto-focus assist light. Why would anyone want to disable the AF assist light? You are probably wondering if my mind has gone off the edge.

Sigma 8mm F3.5 EX DG Circular Fisheye -- The High Resolution Lens. Sun, 21 Mar 2010 12:01:56 -0700. Sigma APO 70-200mm F2.8 II EX DG MACRO HSM Won't Auto-Focus.