How to collimate the R200SS
First loosen all the three collimation “push” screws and tighten the other three
collimation “pull” screws on the primary mirror cell completely to “reset” the primary
mirror to a position where the primary mirror is placed closely to the mirror cell.
1.
Remove the blue cap on the center of the four-vane spider to access adjustment
screws for collimation. Loosen the fixing screw on the dead center of the spider to
remove the secondary mirror holder with the mirror. There might be some
washers on the center fixing bolt with which the secondary mirror holder is
attached and please take care not to drop them onto the primary mirror.
2.
Put a tiny dot at the center of the optical axis of the secondary mirror (offset 3.8mm
from the center of the elliptical secondary mirror, refer to the Figure 2) by using a
template below. A size of the dot should be about 1mmm to 2mm in diameter.
3.
Return the secondary mirror holder with the mirror to the original place, and
tentatively fix it with the fixing bolt lightly. At this stage do not touch the other
three adjustments screws on the secondary mirror holder.
4.
Draw a circle with diameter of 55mm on a black paper to make a disc. Open a pin
hole of about 1mm to 2mm at the center of the disc. Cut out of the disc and place
it into the change-over ring shown in the Figure 1.
