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I assume you mean the comparison for visual only?
I haven't seen any quality images from Mewlons. They are high focal length and smallish central obstruction scopes.
Meade ACFs though do produce a lot of good images and you'd get more aperture for your dollar if imaging was your game.
Planewave make corrected Dall Kirkhams (Mewlons are Dall Kirkhams) and are imaging /visual instruments with lots of happy owners.
Orion Optics UK also make a corrected Dall Kirkham and are about to produce an 8 inch one at F6.8. That would be similar to Mewlon 210 but shorter focal length. They don't have many examples out in the field yet but seem to be capable of producing a high quality product that on paper appears slightly superior to Planewave (but slow production). Ceravolo astrograph is also corrected Dall Kirkham (it seems to be all the rage in telescope design these days).
If visual only I imagine the Mewlon would be the one to beat. If imaging then the Planewave (big dollars) or the Meade ACF for bang for your buck.
Greg.
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