First Compact and Lightweight 600mm Super Telephoto RF Lens. Excellent Portability made Easier with an Extending / Retracting Locking Lens Barrel Design. Gapless double-layer Diffractive Optics (DO) reduce Chromatic Aberration for High Image Quality. High Image Quality at a fixed f/11 Aperture. Super-telephoto prime is designed for use with full-frame Canon RF-mount mirrorless digital cameras Optical Image Stabilization with up to 5 Stops of Shake Correction.