Ben Z
Veteran
I've been around a -4 since I was in elementary school. I never bothered with diopters on my cameras because taking my glasses off to shoot left me unable to see anything outside the camera until I put the glasses back on.
Finally the usual happened and I started to also need correction for close sight, so I got progressive lenses. The first pair I got were from Lens Crafters and I couldn't get used to them after months. Then a family friend who's an optometrist in another country told me to try Verilux Comfort lenses. Of course Lens Crafters assured me their lenses were just as good, but I went ahead and got Verilux anyway, and long story short, I was used to them by the time I left the store, and drove straight to Lens Crafters and got my money back.
But I digress. Now, I find that I need to use the middle of the progressive lenses to see clearly through a camera (that doesn't have an adjustable eyepiece). My close prescription is a +2 Add (effectively bringing me to a -2), but I find that with a +1 (on a Leica), +0.5 (Nikon F) or +2 (Rolleiflex) I can use the top part of my glasses, which is more comfortable for me.
The Leica diopters are, fortunately, rubber-coated. Before them, I replaced the eyepieces on my M4's with M6 eyepieces, which are the same optically but have rubber. They'll fit an M2 also. When I had an M3 (which requires different optics than the M2,3,4,5,6,7 etc.) I got one of the rubber-coated corrective diopters and knocked the glass out of it. That worked better for me than any of the other means of rubber or plastic coating the M3 eyepiece.
Finally the usual happened and I started to also need correction for close sight, so I got progressive lenses. The first pair I got were from Lens Crafters and I couldn't get used to them after months. Then a family friend who's an optometrist in another country told me to try Verilux Comfort lenses. Of course Lens Crafters assured me their lenses were just as good, but I went ahead and got Verilux anyway, and long story short, I was used to them by the time I left the store, and drove straight to Lens Crafters and got my money back.
But I digress. Now, I find that I need to use the middle of the progressive lenses to see clearly through a camera (that doesn't have an adjustable eyepiece). My close prescription is a +2 Add (effectively bringing me to a -2), but I find that with a +1 (on a Leica), +0.5 (Nikon F) or +2 (Rolleiflex) I can use the top part of my glasses, which is more comfortable for me.
The Leica diopters are, fortunately, rubber-coated. Before them, I replaced the eyepieces on my M4's with M6 eyepieces, which are the same optically but have rubber. They'll fit an M2 also. When I had an M3 (which requires different optics than the M2,3,4,5,6,7 etc.) I got one of the rubber-coated corrective diopters and knocked the glass out of it. That worked better for me than any of the other means of rubber or plastic coating the M3 eyepiece.