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The camera/coma corrector inserts into the barlow. Re your OAG, the Lacerta OAG is designed for Canon sensor spacing and will not affect the coma corrector spacing as it is also the camera bayonet fitting. If I was going to use OAG it would be with the Lacerta. Watch out for the cheaper OAGs which allow flex under that sort of load. Teleskop-express carries the Lacerta.
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