Leica M eyepiece diopters

Dave:  Just so you know you're not alone. . .

I have two .72x bodies, an M4-P and an M6TTL. I also have the 1.25x
magnifier, which gives them M3-ish magnification.  I'm nearsighted, and I
wear either bifocal glasses or "monovision" contact lenses. The contacts
give me distance focus in my right eye, and computer/reading focus in my
left.

Wearing either my glasses or contacts, I can see the viewfinder image
quite comfortably with my "distance" prescription.  But when I use the
magnifier, I see a clearer image if I use my "near" left eye when wearing
contacts, or the bottom (reading) portion of my bifocals.

I first realized this while shooting a classical concert with a 90
Summicron and the 1.25x magnifier. So I became a left-eyed shooter for the
evening.

So it appears that the higher magnification needs a different correction,
at least for middle-aged eyes.  Can one of our optical experts explain
why?

--Peter

"Dave Saalsaa" <SaalsD@xxxxxxxxxxx> wrote:

> As my eyes get older along with the rest of me, I have had to add
> corrective diopter lenses to the eyepieces of my other SLR cameras.  My
> Leica Ms seem to still work fairly well for me though.  One thing I have
> noticed is that on my two M3's the view is not quite as sharp as on my
> M4-P and M5.  All cameras have been CLA'd fairly recently so they are
> quite clean and bright.

> But I am wondering if the diopter value on the M3's may be a bit
> different than on the newer version Ms.  Also does the corrective
> diopter eyepiece from Leica screw onto the old eyepiece or does it
> replace it completely.  In either case I need to know what the factor
> spec is on the aforementioned Ms I have.  Anyone have the answer here?


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