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Lewis I had a Masuyama 45 and Mental has another, possibly 30 or 35mm.
IMHO they were good for their time but that era has passed - the Vixen LV50 and LVW 42 are both superior to the Masuyama 45 which IMHO wasn't as sharp as either, in side by side tests on my two Mak 180mm scopes.
As for use in an f/4.5 dob... ok yes, but so is an Edmund RKE which has about the same FoV. They're good eyepieces, sure, but nothing magical. I don't see why people pay stupid prices for these - eyepieces are not collectible investments and they don't get better with age.
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