First Compact and Lightweight 800mm 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.. Optical Image Stabilization with up to 4 Stops* of Shake Correction.