Alex,
I rarely venture sub-20mm, so can only speak from there. I use the LV 20 and the "generic" 40mm, and occasionally the LV 24-8mm Zoom. I am using it through a Vixen FL102S refractor, but have also used them through the MN190 with similar results.
I did try an LV 4mm when I had it, and it was dim. Quite. I didn't like it that much, but it was an OK match on the WO 72mm refractor I had, giving decent enough images on Saturn.
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