The 70-200 for the weight conscious photographer. This lens provides the same range, and most of the image quality of it’s f/2.8 counterpart for half the weight and an inch less length.
A major overhaul of Canon’s vernerable 100-400 L zoom that’s better across the board. Better image quality, better weather sealing, better IS and faster AF. A go to lens for many wildlife and action photographers.
A venerable workhorse for many bird and wildlife photographers, the original 100-400 is a story of compromises. It’s decent optical quality is countered by a fragile zoom mechanism and 2-stop IS system.
Canon’s EF 600mm F/4L IS USM is one of their largest super-telephoto lenses. It’s big, heavy, and most importantly expensive, but when it comes to image quality it’s hard to beat it.
A reasonably good preforming macro lens at a slightly unusual focal length (150mm), though it still provides an f/2.8 aperture. Now supplanted by a newer design.