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UPDATE
The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being. I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure. ------------------------------------------------------------
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i want to get a 70-200 f/4 since i already have a 2.8 (not one that would be expected 
) but it's too heavy for taking it backpacking.
I know the IS version has a revised optical formula and from what i can tell from the IQ comparison on TDP, there is a slight advantage for the IS version, but only at 200mm...
my question is: is the IS version worth it over the non-IS? is that slightly better IQ @ 200mm visible in real life?
I have seen comparisons only between the 2.8 non-IS and 4 IS, since these are about the same price...
) but it's too heavy for taking it backpacking.I know the IS version has a revised optical formula and from what i can tell from the IQ comparison on TDP, there is a slight advantage for the IS version, but only at 200mm...
my question is: is the IS version worth it over the non-IS? is that slightly better IQ @ 200mm visible in real life?
I have seen comparisons only between the 2.8 non-IS and 4 IS, since these are about the same price...