AF Fine Tune... @ 300mm f2.8

Jun 11, 2009
Baton Rouge, LA / Bham, AL
I have a technique question regarding AF Fine Tune, but on a long scale. I've set up a simple small scale AF Fine Tune test before for other lenses. Does anyone have a recommended setup for 300mm f2.8? I want to test close focus as well as long focus, so this will obviously need to be done outdoors. I was thinking hash marks on a football field, but I can't find a nicely painted field this time of year. I've tried it along fences but I can't find fencing with enough contrast to get consistent focus points.

I'm open to any and all ideas.
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