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I once cleaned an orthoscopic eyepiece by taking it apart. It took me four days to finally be happy with my putting it back together.
Despite my best efforts, and using supposedly the best cleaning paper, every time I assembled it and held it up to the light, I'd see some speck or fine piece of fibre on some inner surface.
A fine speck inside is only really annoying if using the eyepiece during daylight or on the moon. Best leave it as is.
Regards,
Renato
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