Post by Mark McLaughlin on May 3, 2015 19:42:33 GMT -8
Last night went well. Except not with the club scope, but my own 16" Lightbridge. D.S. and I spent a couple of hours reassembling the secondary mirror and getting it collimated. But despite my best efforts could not get the big mirror to stay put. With all the looky loos and neighbors coming over,i thought i better do something as i has told all to come over and see. Venus wasn't much of a hit. Jupiter on the other hand astounded everyone. We watched all four moons on one side all lined up. After all had their turn we looked again. Most all saw that the one moon had disappeared,it was neat to hear them all get a sense of what was happening. Next up was the nearly full moon. With the famous Ethos 21 in the holder, it filled the entire field of view. Now I got loud wows and oohs! A couple of newbies had to look again and again. We did the white paper projection from about 3 feet away to show everyone at once the location of the major features. After that i got a list of features they had discovered for themselves.
Now today, i spent some time getting the 20 ready for tonight. It looks like the sling came loose as did one triangle nut. Realized the club laser isn't long enough to see the pattern in the drawtube. Hotech to the rescue. Catseye for double check,wow dead on, no PAE or FAE. Derrik, you where right in moving the focuser over to the original holes.
Post by deepskydarrell on May 4, 2015 8:02:54 GMT -8
Well done Mark and Derrik. You've done extremely well. I've never thought of doing a Moon projection on a sheet of paper for a group look. Even with Jupiter getting smaller it's still a hit. Seeing movement over time really makes an impact.
I've always abhorred the Kriege style nylon sling. So glad I used steel banding without the split bolt. The two ends of the sling are soldered onto headless bolts that pass thru angle iron on the mirror cell. Sling hasn't moved in 13 years.
Thanks for all your great work on rescuing the Club 20.
16.5 inch F 5.3 Zambuto Optics homebuilt Dobsonian