The 70-200mm f/2.8 lens is the workhorse of choice for a wide variety of photographers, but given its size and cost, creatives who do not need the f/2.8 aperture may opt for the lighter and cheaper f/4 version. If such a lens sounds right for your work, check out this great review of the Canon EF 70-200mm f/4L IS II USM.
Coming to you from Christopher Frost Photography, this great video review takes a look at the Canon EF 70-200mm f/4L IS II USM lens. 70-200mm f/2.8 lenses are typically fantastic tools, but they also normally cost somewhere between $2,000 and $3,000 and are quite bulky and heavy. Canon's 70-200mm f/4L costs anywhere between $599 and $1,299 (depending on whether you get the IS version or not) and is also much lighter and smaller, making it a great alternative for any photographer who does not need the extra light-gathering abilities or narrow depth of field provided by the f/2.8 version (landscape photographers, for example). In addition, you also get excellent image stabilization capabilities that offer up to five stops of compensation along with excellent weather-sealing and quick and quiet autofocus. Check out the video above for Frost's full thoughts.