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Old Aug 8, 2010, 5:30 PM   #4
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Join Date: Nov 2005
Location: Frazier Park, CA
Posts: 16,106

K7 isn't the greatest at high ISO, not like the Kx, but whether you really need f2.8 depends on your application. There are other reasons to use f2.8 besides slowing the shutter speed - changing the dof. Just my opinion, but if you don't need f2.8 for the dof or the faster shutter speed, and weight/size isn't a factor, then I would decide on which focal length you really needed.
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