Below are reviews for these primary "100mm" professional options. Canon EF 100-400mm f/4.5-5.6L IS II USM Lens
: It features an outstanding Image Stabilizer (IS) system that provides up to 4 steps of correction. DustinAbbott.net highlights its "remarkable" ability to keep the viewfinder stabilized even with an extender. image_large_100
: Reviewers at Digital Camera World describe it as an ideal choice for action, noting its sharpness throughout the zoom range. Below are reviews for these primary "100mm" professional
Relatively heavy, often referred to by users as a "beast" to carry. image_large_100