While the Canon version of this teleconverter costs $449, Yongnuo is selling its clone for just $180 over on Amazon. Yongnuo YN-2.0X III Teleconverter [Amazon via CanonWatch ] Equipment , News
If you buy a 2x teleconverter and are going to use it on any lens other than the ones listed below, you are probably not going to be happy with the result, if it works at all: - Canon 70-200mm f/2.8L - Canon 70-200mm f/2.8L IS II - Canon 200mm f/2 IS - Canon 300mm f/2.8 IS or IS II - Canon 400mm f/2.8 IS or IS II - Canon 500mm f/4L IS or IS II The EF 100-400mm f/4.5-5.6L IS II USM is a lightweight solution for photographers who can only travel with one telephoto lens. Ideal for professionals shooting sports and wildlife, with the 100-400 mm zoom range you can get up close to distant subjects without needing to disturb the scene, and the Zoom Touch Adjustment ring sets the amount of resistance felt when zooming, ideal for working inCanon has the RF 1.4x and RF 2x. I would guess that they are compatible with all L series telephoto lenses for the RF mount.Extender EF x2 II de Canon. Multiplicateur de focale. Avec un multiplicateur de focale, l'ouverture effective de l'objectif est diminuée de 1 ou 2 valeur (s) selon le modèle utilisé. L'autofocus ne fonctionne plus si cette ouverture résultante devient plus petite que f/5.6 (plus petite que f/8 avec un EOS 1v et un EOS 3). The Extender RF 2x offers sharpness and versatility with 2x extra magnification to double the reach of compatible RF telephoto lenses and zooms. View details RF 2x EF Lens Extenders 9BRHx7c.