Bushnell used to make one of their mid-range binoculars that instead the usual wheel type dial it had a "wing" type dial, a short wing mounted on the where the adjustment wheel would normally be. You focused the adjustable eyepiece for around a 100 yards or so and then to see clearer at far or near distance all you did was press down on the left or right extension. It was a very fast focus system and people who used them really liked them, they were especially good for football game, baseball games, etc. with varying distances and lots of fast action.
I had a Leupold bino with individual focus eyepieces and they were very fast to use, I would adjust the focus for around 100 - 150 yards and items from close to far were in focus well enough be useable. If you wanted to have a clearer picture then you could fine tune them for distance but for general purpose they didn't need it.
drover
