Canon RF 800mm f/11 IS STM Full-Frame Lens for RF-Mount, Black {95}

Canon RF 800mm f/11 IS STM: 800mm reach at backpack weight.

Getting 800mm into a pack that doesn't wreck your back has historically required either compromise or significant expense. The RF 800mm f/11 IS STM solves that through gapless double-layer diffractive optics, an optical design that achieves the refractive equivalent of far more glass in a 11-element, 8-group formula weighing just 1,260 g. The fixed f/11 aperture is the trade-off that makes the size possible, and Canon's 4-stop optical IS goes a long way toward making that aperture workable in the field. Handheld shooting at 800mm becomes genuinely practical, not just theoretically possible.

The STM autofocus motor runs quietly enough to avoid spooking wildlife at closer distances, and the internal focus design keeps the physical length constant during tracking. A 95mm filter thread up front accepts standard circular polarizers and ND filters. The lens also accepts Canon's RF 1.4x and 2.0x extenders, pushing reach to 1,120mm or 1,600mm respectively, with the camera's subject-recognition AF still operational. For photographers who want serious reach without committing to the size and weight of a traditional super telephoto, this lens represents a, proven option in the RF system.

Who It's For

Bird photographers working from hides or on foot will appreciate the 800mm reach paired with quiet STM focus tracking during flight sequences. Wildlife shooters who travel to remote locations benefit from the 1,260 g weight and retractable barrel when packing in and out. Aviation and airshow photographers get the angle of view compression and 4-stop IS combination that makes handheld tracking feasible across a tarmac. Sports shooters at outdoor venues who need distant coverage but can't carry a 600mm f/4 all day will find the fixed f/11 aperture a worthwhile exchange for the portability.

Key Features

• 800mm f/11 prime with gapless double-layer diffractive optics
• 4-stop optical image stabilization for handheld telephoto work
• Silent STM autofocus with internal focus design
• Canon RF mount, compatible with RF 1.4x and 2.0x extenders
• 11-element, 8-group design weighing only 1,260g
• 95mm filter thread for circular polarizers and ND filters

FAQ

How does Canon fit 800mm into a lens that weighs only 1,260g?

Gapless double-layer diffractive optics let a single DO element do the work of multiple conventional glass elements, cutting weight without sacrificing optical performance. The fixed f/11 aperture is the key trade-off that makes this possible.

Is the f/11 aperture actually usable for handheld shooting?

Yes. The 4-stop optical IS gives you workable shutter speeds in decent light, and STM autofocus is fast enough to track moving subjects. You'll need bright conditions and potentially higher ISO, but handheld 800mm is genuinely practical here, not just theoretical.

Does this lens work with Canon's teleconverters?

Yes. Both the RF 1.4x and 2.0x extenders are compatible, pushing reach to 1,120mm and 1,600mm respectively. Subject-recognition autofocus remains operational with either extender attached.

What's the autofocus motor like in practice?

STM motors are quiet and smooth. You won't spook wildlife at closer distances, and the internal focus design means the barrel length stays constant while tracking. Silent operation matters when you're trying to photograph animals that bolt at noise.

Can you use standard filters on this lens?

Yes. The 95mm filter thread accepts circular polarizers, ND filters, and standard threaded accessories without special adapters.

How sharp is this lens compared to traditional super telephotos?

The DO optics manage chromatic aberration well, delivering clean detail across the frame. The fixed f/11 aperture actually works in your favor here-there's less optical compromise than a variable-aperture design at the same focal length would have.