RJM
Don't Worry, Be Happy!
I have the 13-40 zoom and 20x MC Wide for mine.
I think for the visual user this combo maximizes utility, at least theoretically given resolution of the ED50 maxes out ~21x.
13x gives you the brightest possible view.
40x delivers the highest possible magnification.
20x Wide MC provides the max FoV while still not penalizing brightness in good light with its 2.5mm exit pupil.
For digiscoping, resolution seems to top out at ~19x for most current digital cameras.
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