Diopters

[1manilaboy]

Can anyone shed some light on this problem I am having. Just received a +2 diopter (without instructions) cannot figure out where it goes in the eyepiece, in front of or behind the lens that is already in there?
thanks loads,

Rene

[Ed Sukach]

Can anyone shed some light on this problem I am having. Just received a +2 diopter (without instructions) cannot figure out where it goes in the eyepiece, in front of or behind the lens that is already in there?
thanks loads,Rene

The term "diopter" actually is a measure of lens curvature. It has come to mean, generally, a lens inserted into the viewing system to correct for vision anomalies. Chances are (~75% or so) it replaces the "standard" eyepiece lens - the one nearest the eye of the observer. In the Hasselblad prism, the "standard" eyepiece lens is removed - right hand thread - and the replacement screwed in.

Depending, though - it may be an auxiliary lens that fits over the existing eyepiece lens.

Careful, too - some of the so-called "Portrait" or "Close-Up" lenses are labeled in "diopters".

What are the physical dimensions of this puppy?

[1manilaboy]

Well, I tried removing the existing eyepiece lens and put in the diopter and all I had was a complete blurr. So I figured out how to add the diopter in front of the existing glass and what I got was a little worse than without the diopter, it measures about 1 inch in dia.

Rene

[glbeas]

Well, unless you have glasses and your eyes are getting old and frail you probably don't need an eyepiece diopter. If this does apply to you then you would probably want one that approximated the diopter of your glasses. This is usually done because its kinda hard to look through some viewfinders with glasses on as you can't get your eye close enough to see the whole frame.
At worst you can rig a mount to use the lens as a closeup add on.