Archived posting to the Leica Users Group, 2000/11/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Jim Brick jotted down the following: > These systems are simply dumb. Photographers give them too much intelligence. > Even those using fuzzy logic and AI use math to interpret contrast ratios and > gray densities. Humans are much smarter than this. This is why the same lens > touts a higher lp/mm resolution if hand focused vs if auto focused. I agree that systems are dumb and photographers provide the intelligence, but isn't contrast differences what all focus systems use? Ground glass, rangefinder patch, and autofocus? If we look at something that doesn't have sufficient contrast difference, we cannot tell if it is in focus or not. If you get a higher lp/mm because the human eye is better at detecting correct focus than the autofocus algorithms, then that STILL doesn't mean that knowledge of the subject has anything to do with it. How would knowing that you're taking a picture of a car or your aunt Agda make a difference to determining whether the hood ornament or Agda's eyes were in focus or not? Why on earth would you have different focus algorithms for Asians and non-Asians??? Are Asians' eye-sight better than ours?? M. - -- Martin Howard | "...key features are the distinctive rear Visiting Scholar, CSEL, OSU | lighting clusters that make the Maserati email: howard.390@osu.edu | 3200GT instantly recognizable to anyone www: http://mvhoward.i.am/ | overtaken by it." -- Maserati sales lit. +--------------------------------------------