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 ...

This is an extremely sharp macro lens that is capable of 1:1 ratio. I use it to get close-up of flowers, insects, and other tiny objects. Some of the lens ...

The Sigma 24-60mm F2.8 EX DG Lense is one of sigma's latest professional lens creations. Although simple in design, the overall lens offers a stunning array of ...

The auto-focus mechanism on this lens is based on Canon's micro motor. It is noisy and doesn't sound very smooth. In low-light and low-contract situation, it ...

8 all through the zoom range. The Sigma APO 200 to 500mm F2.8 EX DG lens is an exciting product from Sigma that can be used to create amazing images with best ...

A solid-built ultra wide-angle lens.

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 ...

This Canon EF 24-70mm f/2.8 L USM lens actually compliments a plethora of other equipment I have for my Canon. The 24-70 L has a magnification of 0.29x at 70mm.

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

Canon EF 50mm f/1.8 II. 5 Straight. f/22. 0.45m / 1.5'. 1:6.7. 52mm. Canon EF 50mm f ... 4 EX DG HSM Art (Canon EF / Sony E). 9 Round. F16. 40cm / 15.7". 1:5.6 ...