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diggitydawg510 wrote:
so for fine tuning the 70-200, should I set it @ 200mm @ f/2.8?
Unfortunately, zoom lenses can be 'far sighted' at one focal length (i.e. 70mm) and 'short sighted' at the other (i.e. 200mm), so for zoom lenses it's not possible to tune them for all focal lengths perfectly. I wish it were. My 18-200 for instance need about +5 at 18mm and about -2 at 200mm 
So, unless your zoom needs the same adjustment throughout it's focal range, this is not going to be much help.
For primes it's about as good as it gets....
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