Canon released two unique lenses with the Canon RF 800mm f/11 IS STM and RF 600mm f/11 IS STM. Here is a RF 800mm f/11 IS STM review.

Christopher Frost Photography posted their Canon RF 800mm f/11 IS STM review.

At a glance:

• Super-telephoto prime is designed for use with full-frame Canon RF-mount mirrorless digital cameras
• Fixed f/11 aperture contributes to the sleek and portable form factor as well as a balanced mixture of depth of field and sharpness
• Gapless dual-layer diffractive optics contribute to a marked reduction in chromatic and spherical aberrations as well as benefit the design of a relatively compact and lightweight lens
• Retractable/extendable design, with a locking lens barrel, offers an impressively compact form factor considering the super-telephoto design
• An Optical Image Stabilizer helps to minimize the appearance of camera shake by up to four 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 is ideal for video recording as well as still shooting
• Configurable Control Ring can be used to adjust a variety of exposure settings, including aperture, ISO, and exposure compensation
• Compatible with optional Extender RF 1.4x and Extender RF 2x teleconverters to further increase the effective focal length.

Also interesting: an interview with the engineers who made these unique lenses.

Canon RF 800mm f/11

America: B&H Photo, Amazon USA, Amazon Canada, Canon Canada, Canon USA
Europe & UK: Amazon DE, Amazon UK, Amazon IT, Canon IT, WEX Photographic, Canon FR, Canon UK, Canon DE