diopter correction lenses for the eyepiece

Does anyone out there have experience with add-on diopter correction
lenses for DSLR eyepieces? Are they effective? Do they add so much
thickness that you cannot see the whole screen? Do you use them with
or without your glasses?

What is the "virtual distance" to the screen?

I am old enough to have very little accommodative power left, so I
would probably need a close guess at the right distance and thus
correction power.

Bob S

 

I use one on my Canon DRebel. It works fine, it's not at all
obtrusive unless I want to put something else on the viewfinder.

I like to use the camera without glasses. I wanted a plus 1, had to
get a plus 2 and dial in a minus 1 with the built-in diopter
adjustment in the camera.

I don't know the virtual distance. Me needing a plus 1 would
indicate that it's at infinity. My distance correction is plus 1.

 

Your choice, though the choice changes the diopter strength
unless your prescription and eyesight are both best at one meter
(my glasses are...) and you cannot use the VF variable-diopter
feature to do what you want.

Usually about a meter, modified by the setting on the VF diopter
adjustment. BTW, I made up a 4-way glasses arrangement that
gives both ideal camera viewing and ideal general seeing - see it
at - http://www.donferrario.com/ruether/articles.html#glasses

 

Infinity. As exploited by my design:

http://www.truetex.com/canon_viewfinder_magnifier.htm

 

I wear progressive bifocals (no line) and it seems to me I can focus
fine at any distance so the viewfinder diopter stays zeroed out. The way
to tune that is make the numbers, info at the bottom & grid sharp. With
glasses it's at zero, without it's +2 tics on the adjustment. I can't
easily read the top LCD without the bottom of the bifocals.

 

My $.02 ... it'll adjust for diopter, but not for other conditions like
astigmatism (i.e., if you're trying to displace the need for glasses).
Nikon's add about 3/16" behind the eyecup. No problem viewing the whole
screen.

I considered grinding a prescription lens to fit a diopter adjuster
frame, only to discover that astigmatism has an axis (so the solution
wouldn't work in both portrait and landscape camera orientations).

In the end, it was less satisfying but easier to just leave the glasses
on when shooting.

Cheers,
Richard