AFFT distance anomoly?

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BCcanuck

BCcanuck

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In trying to AFFT my new 300mm f2.8 + 2.0 TC III I came up against an insurmountable problem that prevented me from carrying out the procedure indoors. The minimum recommended target distance for a 600mm focal length is 40 feet. Tha longest I can achieve indoors is 33 feet so, I guess I go outdoors? Not in 12 inches of laying snow and minus double digit temperatures I don't so, I guess I have to wait until Spring?

I spent considerable time researching this to try and determine if the recommended target distances are critical and they are, or they are not, depending on who you believe.

Given the wealth of expertise and experience here I would like some opinions based on real world experience please. What distance formula do you use and why?
 
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The distance estimates are just that - estimates. Nikon typically says the "ideal" distance is the distance you typically are from your subject. However, for most of us that's of little help since we use most of the lenses focus range - sometimes all in one day!

I'd wait until I could do it at little bit a longer distance myself. Also, I would try the combo out in the field first and see if I saw any front / back focus issues. Often AFFT isn't necessary at all.
 
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In addition, I'll add that the best distance is the one you'll be shooting at. The AFFT will change with temperature, the comp you enter at 40F will be different from 80F. As Steve said, if you don't see a need for it, leave it alone.
 
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