In article
>Alas, my near vision has deteriorated to the point were I have a hard time
>reading the exposure meter on the viewfinder, specially when shooting with
>available light.
>
>I have a Nikon FE, for which eyepiece diopters are available, the question
>is what power should I get? My prescription is:
>
> Distance Near
>O.D. +0.75 +1.50
>O.S. +0.75 +1.50
>
>For reading glasses, my eye Doctor says that the diopter power is the sum
>of Near + Far, or +2.25, but what should the diopter strength be for the
>camera?
>
>I can not find diopter eyepieces locally, so I can't just try several and
>then get the one that works best. I'll have to buy them through the mail,
>so I need to know what to order. Can anyone help?
Since you don't have astigmatism (at least you show none in the
prescription), an eyepiece correction probably is the best way to go,
though getting just the right one is not easy. You may need to account
for the roughly +1 diopter in the eyepiece already, and I find that
.25 diopter error is enough for me not to be able to see the screen
sharply enough for focusing. The best way may be to take the camera
with you to your eye doctor, and try various diopters over the camera
eyepiece until you hit the best one (go in 1/4 diopter increments).
If the value you come up with is not a whole diopter number, and you
cannot see the screen well enough using a whole number diopter, you
may need to have a special one made for your camera. I solved the
problem of glasses, barely-focusing eyes, bi-focals, etc. by having
my non camera focus eye corrected for infinity, my camera focus eye
corrected for the camera VF distance (about three feet), the non
camera focus eye bifocal set for a closer distance, and the camera
focus eye bifocal set for an even closer distance (my bifocals are
25mm flat-tops, set low in large lenses to maintain good distance
wide-angle vision), giving me four distances for sharp focus, one
of which is optimised for my cameras. This has worked well for me,
though it took a while to get used to night driving and movie viewing
with them (but I now have continuous good focus from infinity to less
than one foot [and great camera VF sharpness], whereas before, there
were distances at which I could not see sharply).
Hope This Helps