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Well, the startest was a disaster. Way off. So It was back to basic. And my friend Mike (owner of the Hotech) offered to see if two heads could be better. I jumped at the offer so today we went step by step.
Step 1. Get the focuser pointing to the donut on the secondary. Used the Glatter with the narrow beam for that. OK.
2. To get the secondary in the same axis, I inserted the paper mask down over the baffle tube and got the return reflections from the Glatter circular hologram back to it and got it all concentric. So far so good.
3. The next trick was to get the Hotech hologram lined up properly with the Hotech screen. We did this by just projecting the circles onto the Hotech screen and centering everything.
4. Here's a new trick. And why 2 sets of hands work. By withdrawing the Hotech from the focuser tube and moving it around, it became easy to see the shadow of the secondary on the screen. So I got Mike to use a pencil to quickly mark the circumference of the shadow. That is what should be the centre of everything. So it was then easy to adjust the primary while centering up on that. I found that focusing way out helped too.
5. Having done that it was easy to go back to adjusting the secondary again an then using the Hotech to finish. The 3 dots were so close that it took some light tweaking on the primary to finish.
I reckon it's nailed.
Sky time required now.
Peter
Last edited by pmrid; 22-05-2014 at 08:26 PM.
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