Diopter Correction Lens + Viewfinder Magnifier?

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... Leica 1.25× magnifier to help with my Elmarit 90 mm and 135 mm 1:4 on the M9. It's not as sharp with the mag plus dioptre, as without the mag, but with a +1.5 dioptre lens on the camera directly.

If you're using a +1.5 dpt correction lens on the bare eye-piece then you'll need a +2.0 dpt correction lens on the Leica 1.25× and 1.4× magnifiers—umm, on the 1.4× magnifier you may possibly even prefer a +2.5 dpt correction lens. The magnifiers add some negative correction ... they shouldn't but alas!, they do (don't ask me why). So try those correction lenses before you buy!