RF-Mount Lens/Full-Frame Format Fixed f/11 Aperture Retractable, Locking Lens Barrel Gapless Dual-Layer Diffractive Optics An impressive and incredibly unique super-telephoto, the Canon RF 600mm f/11 IS STM is an especially compact and lightweight lens considering its long focal length. Featuring a retractable design and a fixed f/11 aperture, this lens's sleek profile makes handheld super-tele shooting a very real possibility
