Jon, I have pretty good distance vision, decent over all vision. In the last year, though, I've had to use my reading glasses more often for things like TV, reading, night driving. At times it's a little difficult for me to be absolutely sure I have something totally in focus when shooting.
So this lens idea--I can buy an extra diopter lens for my camera, is that what you're saying? And have it made to match my eye prescription? COuld the old original one be put back in if I sold the camera? This is intriguing!
Canon makes slip-on diopter adjustment lenses
that go in place of your existing eyepiece cup (not the viewfinder proper). So the camera isn't modified at all; you just slip a little piece over the viewfinder eyepiece.


...10-15 years ago my eyesite was sharp as a tack .
