What 800mm at f/11 actually gives you
800mm is genuine long-telephoto reach, with the strong compression and narrow angle of view that comes with it.
f/11 is a slow maximum aperture, so this leans on good light or on a stabilised body.
Size and filters
At 1260g (2.78 lb) this is a lens you plan around — it wants a larger body to balance against, and a tripod collar or monopod for extended use.
Filters are 95mm — worth checking against what you already own, since polarisers and ND filters at this size are reusable across any other lens sharing the thread.
Autofocus and stabilisation
Autofocus is driven by an STM motor.
Optical stabilisation is built in, which stacks with in-body stabilisation on bodies that have it and does the work alone on bodies that do not.
