Hi Ang026,
Both the Masu 16 & 10mm are easy to use, I've only had the chance to use the 10mm once for terrestrial but seems to be the better corrected eyepiece of the two. (at f4.5) No blackouts or kidney bean effect to be seen. Eye relief is only 6.5mm in the 10mm eyepiece but that didn't bother me either.
Give me a couple of weeks to try it out and I'll post it if I find anything else.
Cheers
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