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

After experimenting with the camera, teleconverters, and lenses, I realized that the auto teleconverters must be used with auto lenses. Auto teleconverters with ...

i have recently bought a canon eos xti dig camera. i enjoy taking action pics, but only as fun. i also got the ef 75-300mm f/4-5.6 III lens with it. my main ...

i had just tried this evening using my new 1.4 teleconverter with EOS cameras attached to my scope and couldn't get the camera to work except with the ...

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 ...

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.

The Canon EF 55-200mm f/4.5-5.6 USM lens is similar to the Canon EF 75-300mm f/4-5.6 USM in construction. The telephoto zoom lens is long with a telescopic ...

Personal review of the Canon 75-300mm f/4-5.6 II USM lens.

The Canon EF-S 55-250mm f/4-5.6 IS II lens is an opportunity for most new photographers to get a taste of wildlife photography. It's a excellent companion for ...

This lens has Canon's ultrasonic motor (USM), which is silent and fast. I cannot hear the lens auto-focus. It supports full-time manual focus, which means you ...