Quote from: Francis on March 03, 2013, 06:15:42 PM
I have a 100mm macro lens that I use both for macro shots and for portraits. Running DotTune at both a macro and a portrait distance gives different results (-5 at portrait, +4 at macro). Sound I use the average? 0 and -1 lies in the acceptable range for both. Does that sound reasonable or am I missing something? The author suggests 50 x focal length. I almost never use this lens at 5m so it doesn't seem appropriate to set the MA at that distance.
It's not unsual for lenses to exhibit focus-distance variance in tune values. You can either choose the value for a single distance if that's what you shoot at most often, or use the midpoint of the distance values if that produces acceptable results for you.