Originally Posted by seany65
I'm fairly sure that AIS lenses have minimum apeture numbers (16, 22 etc.) that are orange.
Correct, the Nikon brand "official" Ai-s lenses do have the burnt orange minimum f/stop that is color matched to the shutter priority and program mode marks on the various bodies of the day.
Ai lenses, and "official" Ai conversions have white minimum f/stop markings, though it may be possible that some custom or DIY conversions exist that used an f/stop ring from an Ai-s lens.