Hmmm, the way i see it, each individual has their own focusing needs and therefore one person focusing so another can look is not really going to work that great.
Sam, in regard to your self focusing on any object, moving the focusing control to suit your needs is what it is all about.
If your eyes are not as good as they used to be, (like mine) then one would move the focusing control to suit those old eyes.
I am half blind too, but still can get a clear image suited to my eye condition, when i used to do imaging, i used to take off my glasses, focus to as sharp as possible and all would be fine, but when i looked down that tube with my glasses on it would be very blurry.
Leon
