SuperG
14-10-2015, 04:55 PM
This is the 150mm (6") "imaging optimised" Newtonian version I'm talking about here. The OTA came seriously out of collimation.
(1)I've had serious trouble positioning the secondary for good collimation. After rough rotational positioning by eye I've tighten the central screw and then adjust the outside three. What's curious is that when looking at the primary mirror, the laser is super bright on the ring marking but every time I get to centre it appears dim. The laser dot in the collimator looks ok though.
(2)During the day time when looking down the tube towards the primary mirror I can see daylight around the edges of the mirror. Is this normal. It seems that GSO must have put a spacer in the tube to move it back a bit. If normal I guess I'll need to put a sock on the mirror end just in case light leaks in.
thanks
(1)I've had serious trouble positioning the secondary for good collimation. After rough rotational positioning by eye I've tighten the central screw and then adjust the outside three. What's curious is that when looking at the primary mirror, the laser is super bright on the ring marking but every time I get to centre it appears dim. The laser dot in the collimator looks ok though.
(2)During the day time when looking down the tube towards the primary mirror I can see daylight around the edges of the mirror. Is this normal. It seems that GSO must have put a spacer in the tube to move it back a bit. If normal I guess I'll need to put a sock on the mirror end just in case light leaks in.
thanks