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I don't know fahim.. they seem to be odd focal lengths ..perhaps they are rejects from some of the asian optical companies .. by rejects I mean they won't fit the mass produced assemblies so are sold on cheap ??
I did notice over cloudy nights that brian greer (protostar ?)
stated that one of the listed test reports regarding one of these mirrors
was actually posted by him a couple of years back in a public forum.
Caveat emptor..!!!
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