Originally Posted by Sparrow
So can I be confidant that if I can see the “view” clearly and see the patch is aligned properly I have the correct focus? My vision has no effect on it
I need my glasses to find my glasses in the morning. Trifocals, with an extra pair of "computer glasses", optivisor, clip-on loop like the old guy in Toy Story, etc.
The beauty of a RF focusing system is that it is independent of your eyeball. If you can see the rf patch enough to align it, it is in focus. You can focus even if you're not sure on what (witch explans some of my images...). Try focusing with and without your glasses. The patch may be fuzzy, but if you carefully line up the fuzz you've got it.
This is also true of split image SLR screens, the split image but not the ground glass. (I risk getting my rusty physics stomped here, but it seems to work well enough to justify buying two more OM system screens)
If you ware reading glasses to focus a TLR remember that you're focus your eye on something (the ground glass) about as far away as your morning paper. With an RF, or an SLR for that matter, you are looking at the subject. Opticaly the RF is analogus to that rear view mirror where "objects are larger than they appear" and the SLR is a telescope (and yeah, with a wide angle you're looking through the wrong end...)
Be glad you can ditch the glasses to use an eyelevel camera. Eye relief is one distraction and one less concern when selecting a camera.
Problem isn't you're eyes. Your arms are just getting shorter...