With the Leica APO-Televid 65 or 82, this can be an obvious attribute that further pushes the boundaries of what is possible to see and photograph with your spotting scope.
Just like on a system camera, the extender is mounted between the binocular housing and the eyepiece and with a factor of 1.8 the zoom range is extended from 25-50x to 45-90x. It also happens with an impressive brilliance, sharpness and with strikingly little light loss.