The lens is very solid and sturdy, yet not very heavy. Focus ring has full throw, rather than the very short throws on zoom lens, which may be why AF is slow.

Explains the purpose of stacking teleconverters and how to calculating focal length, aperture, and aperture diameter.

The 300D (Digital Rebel or Kiss Digital) doesn't have that switch. It is smart enough to work with both automatic and manual lenses. I suspect that all of the ...

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 ...

The Olympus 1.45x teleconverter is intended for Olympus ZLR camera lines. These SLR cameras have zoom lens permanently attached to their bodies.

Overall, this is an excellent lens. It is the only lens I take with me to shoot roller-hockey games. Based on my experience, the focal length of the Canon 300mm ...

Recently, I had obtained a Digital Rebel. It worked with the lens fine at wide-open aperture. When stopped down, the camera goes into error state. After ...

Nov 19, 2019 · Sigma 105mm EX DG Macro - anyone know how to update the firmware and where can I get a copy of the firmware ?

These teleconverters include front and rear lens caps, lens pouch, and instruction manual. The C-210 model even comes with a built-in lens hood that snaps into ...

The Sigma 20mm f/1.8 D EX DG Aspherical Lens has a clutch-like system for switch between AF and MF modes. The system is very similar to the Sigma 105mm f/2.8 EX ...