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secondary mirrors from Orion Optics

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offset. I guess same for same is simplest if it is an upgrade. But I have on best authority that the offset is unnecessary. Secondary holder stalk/ post can just attach at the centre of the back of the sec mirror. On my stock secondary it is attached with an off-set, causing the secondary to be shifted away from the foucsser. I am glad OO secondaries have good reputation. I am buying a 1/10 wave one. Do ppl feel the 10mm thickness is OK ?

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