Thanks, I was also interested in IQ and at f/9 the IQ is pretty good. I didn't expect it to be as good.
Yes I own the 70-200 and I dont want to buy another zoom lens for the moment. I live in Hungary where I dont have a big variety of lens renting.
So I think I stick to a 2nd body.
1DIV is out of my budget but 1DIII is the same price as the 7D...Is the 1D that much better?
The only problem is, that I carry most of the things with me. Usually 3 lenses 2 flashes 1 tripod and some accessories. The reason is that usually I always need the lens that I left home...So the only thing that I dont like is that the 1D weights twice as much as the 7D.
I don't have the 1DMIII, but some people prefer it over the 7D. I can say that the MKIV is definitely a step up from the 7D.
In my opinion: Lets say that I rated the 1DX to be the best right now with a 10 out of a 10 rating.
The MKIV would equal 9 out of 10.
The MKIII would be an 8 out of 10.
The 7D would be a 7.5 out of 10.
1D-MKIII (1155g): 1.3X crop, only 10MP, 10fps, Pro-body, better weather-sealing, heavier.
7D (820g): 1.6X crop, 18MP, 8fps, Pro-consumer, lighter, Video, pop-up flash
Personally, I would go for the 7D due to the longer crop factor and higher resolution 18MP.
When using the 1.4X extender try to stop-down 1 extra stop if possible to f/5.6
When using the 2X extender try to stop down 2/3 extra-stop if possible to f/7.1
The Diffraction Limited Aperture (DLA) on the 7D is f/7
At 100 meters, your DOF on the 7D @400mm will be 17m, which will be pretty good to keep your skiers in focus.http://www.dofmaster.com/dofjs.html