5DS R, 1D X, 7D, Sigma 10-20mm f/4-5.6, 24mm f/1.4L II, 16-35mm f/4L IS, 24-105mm f/4L, 50mm f/1.8, 100mm Macro f/2.8L, 70-200mm f/2.8L IS II, 100-400mm f/4.5-5.6L, 580EX-II
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Well i got to try an L series lense today. A subcontractor here at work hapens to be a shutterbug and i asked if he could bring his lense next time he comes by. Not th lense im looking to buy first but at least it gives me an idea. He brought a 17-40 f4L. I compared it to my 18-135 kit lense. I thought auto focus was qick with my lense but its quite a bit faster with the 17-40 . images are much sharper , specialy shooting stuff far away and and they are nice from corner to corner .i didnt stop it down at all. I wanted to see how much better it was wide open. Now to save up some cash for an L series zoom lol
Stuart Edwards
1DX Mark II , 6D , Samyang 14mm f2.8 ,Sigma 85mm f1.4A , 24-105mm f/4L IS , 70-200mm f/2.8L IS II ,100-400 f5.6L II , 300mm f/2.8L II , EF 1.4x III , EF 2x III, 430EX II
Since you mention wildlife, I would take a long hard look at the 100-400 L, 70-300 L and 400 f/5.6. I own the 100-400L and it has been great for wildlife first on my 7D and now on my 5DIII. On a crop sensor, I honestly didn't shoot 100-200 mm very often. I can see it's use on FF for portraits, etc. But you mention telephoto and wildlife and that would push me to recommend one of the three lenses mentioned in the first line. BTW, if you ever are so inclined, I loved the EFS 15-85 on my 7D. Great general purpose lens.