|
Thanks Geoff, I think maybe I have it good now, I used the sight tube to center the secondary to the point where if I slide the sight-tube down then the secondary fills it perfectly.. I then tilted the secondary so the primary was fully visible and centered and the center spot was under the sight-tube crosshair, although the crosshair is so out of focus (?) it's hard to be precise - I then used the laser to fine tune it so the spot was exactly in the center of the primary spot. The I put the cheshire in and adjusted the primary so the center spot was centered in the cheshire ring, I then tried the laser and it agreed almost perfectly (return spot just on edge of hole in secondary target). End result is the reflection of the spider is very slightly offset (and I think in fact it is offset very slightly away from the focuser - hard to measure exactly but seeems about 1 mm or so, but I'm told this is correct for an F5 scope) everything else appears lined up.
(The thing that really threw me was the instructions I got off the web which did not tilt the secondary to line up the primary image)
|