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Col, your signature also brings up another aspect of this "clone" eyepiece business.
You list a 35mm Orion Ultrascopic plus a 30mm and 25mm Parks Gold Series pair. These are the same as the "original" Masuyama line. Celestron I believe also released a similar line as did one or two other brands. Difference being they were manufactured AFTER the master optician Masuyama died and the licencing restrictions ended on the eyepiece designs.
There are some manufacturing differences, including QC, case design and coating specs. When pitted against original Masuyamas, these differences are noticeable, but the glass inside the casings are exactly the same - no "clones". There was a premium to pay for the original Masuyamas at the time as they were the best at the time. Still bloody good today too, when used in slower refractors as they were designed for, NOT Newtonians and not for f5 fracs.
I have a 35mm Masuyama - damn nice eyepiece too. But exclusively with my refractors. This 35mm EP is not well suited for Newts.
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