Canon's ultimate L-series telephoto zoom — the EF 200-400mm f/4L IS with built-in 1.4x extender.
The Canon EF 200-400mm f/4L IS USM Extender 1.4x is one of the most remarkable zoom lenses ever produced. It combines a constant f/4 200-400mm zoom with a built-in 1.4x extender that can be engaged with a lever — instantly converting to a 280-560mm f/5.6 without removing the lens. IS provides 4+ stops of stabilisation.
Optical performance is outstanding — L-series flagship quality with fluorite and Super UD elements. Sharpness is exceptional throughout the range. The built-in 1.4x extender maintains quality remarkably well. The constant f/4 provides consistent exposure. IS stabilisation is critical at these focal lengths. Ring-type USM provides fast, precise AF for tracking action.
Canon EF mount, full-frame. Rear drop-in filter holder. Weight is approximately 3,620 grams — very heavy. Build quality is the absolute finest L-series engineering with full weather sealing. The integrated 1.4x extender eliminates the need to carry and swap external extenders. Designed for professional sports and wildlife at the highest level.
Very rare and expensive even used. Check IS, AF, extender mechanism, and all elements. One of the most impressive lenses Canon has ever produced. The built-in extender is a game-changing practical feature — going from 400mm to 560mm with a lever flip during action. For professional sports and wildlife photographers who demand the ultimate in zoom versatility.