Quote:
Originally Posted by Wavytone
Hi Claire, no... It's always nice to see another developing a growing interest in the heavens. That first scope was a half-size twin of the original Oddie refractor at Mt Stromlo, and used for site surveys before it was donated to the school somewhere around 1930. The objective was in coated of course and produced a textbook - perfect diffraction pattern at high power. Your 5" dob probably has about the same light grasp, but shorter focal length.
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My 5" dob unfortunately has no discernible diffraction "pattern", just blurry, wavy lines as I move. I think it could be because of the 6mm thick secondary holder arm.
You were right, I could not see the moon rise at all on Tuesday. At about 2 mins past six I saw what looked like a piece of white cotton hanging in the blue sky which I ignored at first because it was quite high above the horizon. It was my father who recognised it. Together we watched the earth's shadow slip away, as the crescent deepened into a bright golden colour and the opaque "dark side" glowed a little so that we could see some of the darker detail. And the full moon cast dark shadows on the ground.
Claire.