I am at the stage of collimating my DIY 85mm f5.7 scope. I can't seem to get it , somehow.
I Collimate straight through by adjusting the optic axis to the center of the FA of the objective, by adjusting the focuser. I then use the collimating EP to center the circles. I go back and check with the laser and then back with the collimating EP . Everything is OK. I now have an optic axis in the scope.
I now put the diagonal in and adjust the mirror screws until I get the circles in line. I then put the laser in and check if the beam is in the center of the objective. It is off center. The laser beam is centered as it exits the diagonal which means that there is a tilt to the optic axis. If I try to get the beam on the optic axis, the collimation circles are not concentric when checking with the collimation EP.
I have gone back and forth doing this procedure, checked and double checked, to be sure that I haven't done some thing wrong or be sloppy.
I just can't seem to get it together. Any ideas??