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what is EPTA, please? (1 Viewer)

mark clements

New member
On Opticron's website, in the tech specs for eyepiece, it lists EPTA.
Can someone tell me what this is, and it's significance please?
Google and other searces go all over the place, or to the figures in the tech specs, but I can find no definition.
Thank you,
Harry
 
It stands for EyePiece Thread Adaptor - the ring on the back end of the scope - and is used in the specification data to show the three thread sizes, one internal and two external.

HTH

Cheers, Pete
 
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