I do use a lot of things that have built in chips but I also use calculators that don't have built in chip (slide rules). When the users have to fine tune focusing that is actually a bad thing and we users don't have instruments to check for critical focus. But they do it because focusing error is what people can see. Shutter speed accuracy on most cameras even today is not that good but they don't provide us way to fine tune it.
Originally Posted by E. von Hoegh