I think I see it. This is one of those deals where once you see it, you'll never not see it. Probably what I mentioned above.
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So basically this is a 200-560mm f/4-5.6 lens? Now, due to the IS, if it is a highly portable (hand-holdable) lens ... great for sport and stalking game. If not, still, what's the point?Well, a 400mm f/4 lens will cost you $6000+ from Canon. A 500 or 600mm lens from Canon will cost you $10k (though, they will be f/4, not f/5.6). A 200mm lens is another $750, and a 300mm f/4 is another $1000. So, in pure focal length you are getting a 50% discount. And of course you'd have to change between all of those. A 100-400 would presumably be an alternative, but, its an older design and you need to add a teleconverter to get to 560.
I swear only by Kata bags, love 'em and their yellow padding. Got a bunch of different sizes and purposes. Just check their website.
What if it is called 2D or 4D instead?