Maui5150 said:Do I now consider 70-300 F4-5.6L versus the 100-400?
Depends on whether or not you need the extra 100mm. If you plan to shoot subjects where you'll be focal length-limited, the 100-400mm is the better choice. As a general purpose telezoom, I'd get the 70-300 L or the 70-200mm f/2.8L IS II. I have the latter, and it's an amazing lens on FF, great indoors (thanks to f/2.8) and outdoors. The 70-300 L with it's 1-2 stops slower aperture will not be as useful indoors (unless you're using flash).
Personally, I use my 100-400mm quite a bit - but almost exclusively on my 7D for shooting birds. I have considered getting the 70-300 L for use on my 5DII, particularly as a travel lens. I still might, but I'll likely pick up a 24-70mm first, since I tend to prefer faster lenses and the 24-105mm, while it's a great lens, usually requires a flash for indoor ambient light shooting.
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