Canon EF 300mm f4L USM lens mount_Canon EF-S good quality teleconverter that doubles

good quality teleconverter that doubles focal length (at the cost of two stops of light)

hit the buy button and get shootin'

A nice setup

This button-rewind model is probably the cleanest of all the M2 designs

They may have some minor cosmetic scuffing or wear

Canon EF 300mm f4L USM lens mount_Canon EF-S good quality teleconverter that doublesThe Canon EF 300mm f4L USM is a high quality telephoto lens with quick USM focusing and Canon's premium L glass and construction. It doesn't zoom, but it's nice and sharp, and weighs less than Canon's 100 400mm lens plus it's almost a stop faster at 300mm. In very good cosmetic condition, with minor paint and finish wear. Glass has light dust, focusing is good.