Correction Lens for M different than for M9

[malsop]

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I need the Leica correction lenses for the RF viewfinders. I purchased 4 for the M9 (+0.5 through +2.0) and found the +0.5 provided the clearest image for my aging eyes.

 

Before the M240 arrived I purchased another +0.5 but now that I have the M240 I've found a +1.0 provides a clearer image.

 

To double-check I compared the view in the M9 to the view in the M240 with different correction lenses side-by-side. The +1.0 was too much for the M9 and the +0.5 was too little for the M240.

 

So that leaves me wondering if Leica changed the viewfinder optics. I know they went back to a 2 m default on the frame lines but I don't think that would necessitate a change from the -0.5 diopter they built into the M9 viewfinder.

 

Anyone else have this experience?

[hhmrogers]

I just shoot with my glasses on, have done for years and have never met problems. My 'camera eye' lens doesn't seem to pick up scratches either.

[jaapv]

I don't think so; the dioptre correction goes in steps of 0.5 dioptre. If the value of your eye is somewhere in-between, one correction or the other will be best subjectively. I find for instance that a +0.5 correction glass works best for me on the M6 and a +1.0 one on the M9. In the end it is usually trial and error.

[chris_tribble]

Interesting - though with my longsighted eyes I find the +3.5 diopters I used on my M9s work perfectly with the M-240.

[algrove]

I find that using my MM and M240 I do not correct for anything (maybe I should) since my focusing seems to be spot on more often than not. I just seem to hit focus better on the M240 than I remember with the M9. Just had my MM come back from Leica for sensor cleaning and asked them to recalibrate (just in case) and have so emmersed in my new M for the time being the MM is taking a back seat so far.