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Just spent an hour with these guys, 8" f/6 dob. Just some quick impressions:
23mm: usable on axis and up to 50% out from there to the fuzzy field stop. Beyond that: seagulls. Bad internal reflections past the field stop.
10mm: the best of these three, almost in a different league. Good to about 80% out from centre. Ok - ish beyond that. Sharp field stop. The lightest and smallest of these three.
4mm: Seeing not good enough for details but looks promising on axis but the opposite from 50% on out. Colour rather than coma.
Will add more to this later
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