Hey guys after my recent purchase of my 70-200 L, I am looking to purchase a 2nd L zoom/telephoto lens. This lens will primarily be for surfing. I already did my own research before posting and most surfing sites reccomend a 600mm, but also MOST surf spots are reef breaks, where the surfers catch waves much further out in the ocean. Im on the east coast whcih is all beach break, and the waves break much closer. Therefore, i cannot go by their reccomendations and also do not need a 600mm. Here are some shots that I took with my 70-200 at 200mm: I want to get shots like up this close: http://www.hotlineonline.com/images/wallpaper/post800.jpg #1- So my first question is, do you think a 300mm lens is adequate to give me that extra reach? or will I need a 400? I don't have a 300/400 so I cant like "invision" how much more zoomed in it will be? #2- I'm looking at the 300mm f/4 L prime or the 100-400 f/4-5.6 L. What do you guys think? a 300mm w/ a 1.4x teleconverter or the 100-400? What will bring better quality? Sharpness is def one of my main buying points. IDC if a lens is f/5.6 since I'm always at ~f/7.1 anyway. What setup for #2 would you reccomend? Thanks!