|
Collimation #101
Similar to Roger's idea I had a 9.5" f11 reflector ( Ex-BAA) where the square tube was made from 4 lengths of 18mm RHS tubing and the mirror cell was a Y shaped piece of steel plate with a ring to hold the mirror, the leg of the Y was fixed by a bolt and two nuts to the frame, at the ends of the arms of the Y I had long threaded rods ( 3/16") which went all the way to the eyepiece end of the tube through the RHS tube, a couple of big knobs and there you are. This is NOT and original idea, Hargreaves in the 1930's had a similar concept. Works well and easy to use. Got a photo somewhere.
|