Quote Originally Posted by Trowski
It's too bad the 17-55mm f/2.8 won't work on the 5DII, it'll make you want the 24-70mm f/2.8L.
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As Daniel Browning has pointed out, the 24-105mm f/4L IS on FF is better spec'd than the 17-55mm f/2.8 on 1.6x - the FF equivalent of the latter is 27-88mm f/4.5, so by comparison the 24-105mm is wider, longer, faster, and still has IS. True, faster shutter speeds are possible with f/2.8 (since the crop factor applies to DoF but not to exposure), however, the better ISO noise performance of FF compensates for that as well - higher ISO gives you a faster shutter.


Quote Originally Posted by Jon Ruyle
Easy. Just buy the new stuff, but don't sell your old stuff.

That's what I did... [] Well, mostly. I did sell the 10-22mm because the 5DII will be the camera for landscapes (I'll be ordering the 16-35mm next week, I think). I also sold the 70-300mm DO, partly because the novelty wore off, and partly because if I decide that focal range in a portable package is something I want in the future, I'd prefer the slight additional bulk but better IQ and weather sealing of the new 70-300mm L.
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Quote Originally Posted by ddt0725
Does this make any sense at all to do or am I totally insane?
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Well, Denise, I should be the last person to question anyone's gear choices! [:P]But I would suggest thinking carefully about what you like to shoot. The 5DII is not an action camera. AI Servo doesn't do a great job of keeping up with my daughter running towards me, much less trying to track a bird. That's why I didn't get the 5DII until I could do so without giving up the 7D. If you're going to do it, don't keep the 17-55mm unless you plan on getting another crop camera at some point soon (and if you're going to do that, why sell the 7D, which is the king of the crop cameras?!?)


I know it's hard, because with winter coming fast, birds and outdoor shooting outings will probably be fewer. But next spring, would you miss your 7D when the birds come back? Maybe you'd miss it at your feeders over winter?


Also, keep in mind that your plan assumes you can sell all of those items, and as Trowski points out there are rebates on the 100-400mm and the 17-55mm right now, which cuts the price for used copies.


If you plan to shoot mostly portraits, landscapes, macro, and the like from now on, your idea makes a fair bit of sense. But if you plan to keep shooting birds/wildlife, I think the strengths of the 7D for that use outweigh the downsides of 1.6x for the other uses, if birds/wildlife constitute a reasonable proportion of your shooting.


Either way, good luck with your decisions!


--John
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