In what may have been my best-ever UPS delivery, I received two of the finest lenses ever made on the same truck. The Canon EF 600mm f/4L IS II USM Lens and Canon EF 500mm f/4.0L IS II USM Lens had finally arrived - at the same time.

I use this lens mainly for wildlife photography. My last Super-telephoto lens was the 500mm F/4 L series. In my opinion, the 600mm is even sharper and provides much better stabilization at slower shutter speeds. It is rugged and built to top quality.

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  Consistent Output, Durable, Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction

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  Heavy

I use 800mm f5.6 for local wildlife with tripod. Sometime, it did not move quick enough for me to shoot birds in flight. I have only 1 or 2 seconds re-act. So, I use 600mm for handhold to shoot birds in flight. I can move quicker and almost point and shoot..

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  Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction

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  NONE

So I decided long ago I'm not going to own every super telephoto for a number of reasons which are probably obvious to most people. Cost, weight, bulk, etc. I already had a 300mm f/2.8L and I have the "little" 400mm f/5.6L. So I decided I was only going to buy ONE lens larger than these.

Oh yeah baby - had been drooling over and wanting one of these for years. No regrets. Manageable to use as hand held, but long term can be fatiguing. I bought a monopod for it, as well as a blank internal filter housing. I do not like shooting through filters to get a more crystal sharp image.