Canon RF 600mm F11 is STM

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, and optical image stabilization further helps to succeed in sharp imagery when working in difficult lighting conditions. Also contributing to the reduced size is a distinct optical layout, which uses gapless dual-layer diffractive optics as a substitute of a couple of heavier individual elements, which also effectively controls color fringing and chromatic aberrations for high clarity. Complementing this design is an STM stepping motor that delivers quick and quiet autofocus performance that may be suitable for both stills and video needs. Additionally, a Regulate Ring may be integrated into the lens design for intuitive Regulate over exposure settings from the lens itself. If you wish to have more reach, the 600mm is compatible with the 1.4x and 2x RF Extenders for an effective focal length of 840mm or 1200mm, respectively.

Super-telephoto prime is designed to be used with full-frame Canon RF-mount mirrorless digital cameras.
Gapless dual-layer diffractive optics contribute to a marked reduction in chromatic and spherical aberrations in addition to benefit the design of a reasonably compact and lightweight lens.
An Optical Image Stabilizer helps to minimize the appearance of camera shake by up to five stops to better enable working in low-light conditions and with slower shutter speeds.
STM stepping motor offers fast, quiet, smooth, and accurate autofocus performance that may be ideal for video recording in addition to still shooting.