The Canon RF 800mm F11 IS STM (along with its 600mm counterpart) does something pretty extraordinary: it puts impressive telephoto reach in the hands of hobbyist full-frame shooters, provided they can live with a slower, fixed aperture. If that's a sacrifice you can make, you'll be rewarded with a lens many, many times less expensive than the likes of the pro-grade EF 800mm F5.6L IS USM. We put it to work on some of the inhabitants of Seattle's Lake Union – those on the ground as well as in the sky.