Quote:
adjust it like this , no matter where the first dot is (2# mirror near) , just keep it there ,then move the 2# mirror far, and the second dot , if it's not at same position as first dot , adjust screw on 1# mirror. then move 2# mirror back to check again, no need must the two dots at center exactly, near center is ok.
But when I adjust mirror # 1, the distance of both 1st & 2nd dots are just the same. It is just that both dots are in a different location (but then again, the same distance).