The Canon Extender RF 1.4x is the perfect choice for enthusiast and professional photographers seeking more magnification from their RF lenses. This Canon lens extender can increase focal length by 1.4x, and is ideal for press, nature and sports photographers looking for greater reach without the need to carry an extra lens. Benefits The Canon 1.4x extender features high-refraction, low-dispersion glass to control curvature of field and chromatic aberration of magnification for the highest image quality As well as optimised lens coatings, a 3-layer combined lens helps to reduce ghosting by reducing the surfaces in contact with the air as much as possible The exterior is coated in the same white heat shield coating as used on the RF 100-500mm F4.5-7.1L IS USM and RF 70-200mm F2.8L IS USM lens to prevent deterioration in performance in high temperatures Constructed with a mechanism that prevents the lens elements from hitting those of the Canon 1.4x extender This Canon RF extender is designed for reliability and durability with vibrational shock resistance, as well as dust and water resistance for use by professionals and enthusiasts What\'s in the box Canon Extender RF 1.4x Extender Cap RF Lens Dust Cap RF Soft pouch LP811 User Manual Kit Compatibility RF 600mm F11 IS STM Lens RF 800mm F11 IS STM Lens RF 100-500mm F4.5-7.1L IS USM Lens Lens Extender Cap RF RF 400mm F2.8L IS USM RF 600mm F4L IS USM RF 100-400mm F5.6-8 IS USM RF 800mm F5.6L IS USM RF 1200mm F8L IS USM