Upload & Sell: On
Canon recommends a distance of 50 times the focal length. But some have reported that for some lenses, the amount of adjustment needed varies with the distance at which they focus, and they say you should do the adjustment at the distance at which you would typically be focusing. But to me, that seems like an impossible thing to determine, since different situations call for focusing at different distances. To really get perfectionist about it, one would have to make note of the needed adjustment amount at a range of distances, and set the value to reflect the distance at which one is about to focus. Even if one had the leisure to do that in any given instance, it would still be something of a pain in the proverbial... so we each have to decide for ourselves to what extent we want to take it. To coin a phrase, we make our own bed, then sleep in it.