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Originally Posted by elgemcdlf
Probably for adjusting focal length. .....
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My guess that those numbers refer to F/D. (and they probably mean to have a decimal point in front of them) A feed doesn't really care about the focal length, as long as it is sitting at the proper length, but the F/D is important with respect to properly illuminating the dish, and is something that you typically adjust on the feed, by moving the position of the rings with respect to the throat.