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Yugent.... it depend how crafty you are to depend on the cost. I know who ever ends up with bertha will have a finely tuned machine. who knows i might drop the standard mirror out of it and drop in a hand figured piece!
Go for gold on your OAG they are easy, dispite the issues people have had with them. all i do is put mine in, and use the focuser to focus the stars dis regarding the primary cameras focus. then i know the difference between the primary focus and the camera focus. its elementary then to put the guide and imaging camera about the same distance and once you have focused the primary camera again you move the guiding camera the distance you measured previously. bingo your done.
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