Also watch my first post, i ,mentioned like 3 scopes, so can't one of them be using L and the other two sharing RGB then? or say 2 scopes, one with L alone and the other is with RGB and refocusing always, i wasn't talking about a SINGLE achro against a SINGLE APO, but a bi or tri achro against single APO, because that APO is mainly having better optics inside and it is to provide like nearly same focus for all colors.
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