Canon Extender EF 2x II lighting 4 USM lens is a

4 USM lens is a classic 50mm f1

The A900 is a solidy built

1/4" thread below for leg mounting

Basic and easy to use- and it runs off a pair of common AA batteries (included)

with some finish wear and slightly tacky rubber paint

Canon Extender EF 2x II lighting 4 USM lens is aCanon Extender EF 2x II teleconverter, in excellent cosmetic condition. Doubles the effective focal length of the lens mounted to it. Since the teleconverter extends into the back of the lens, not all lenses may be mounted. Please confirm compatibility between your intended lens and this teleconverter. Clean glass and excellent function. Includes front and rear caps, pouch, and box.