Thursday, March 13, 2008

El-cheapo Red dot sight

Today I purchased a VB93007 'red dot sight' from Academy for $4.95. Instead of a dot it is a small red cross. I'll have to figure out a way to mount it as it normally mounts on a rifle's scope mount. Academy didn't have a Daisy red dot but they did have a variety of others. The price was right on this one. I'll have to cobble up something tonight since the sky is clear and the seeing ought to be fairly decent for a change.
Well, it got dark and I tried it out on a bright star or two. The red cross is much too bright even on the dim setting. The glass has some sort of coating that blocks enough light so that only the brightest stars like Sirius are visible in the finder. I may need to either abandon its use or find some way to dim the red cross.
At 10:00 Sirius and M41 peeked out from behind our neighbor's palm tree and I was able to find M41 after looking around a bit. It was actually visible in the RACI and looked quite pretty in the 25mm EP. Lots of blue and red stars and well worth a revisit later. I was surprised that my new altitude scale measured M41's altitude to half a degree. Not bad!
On the moon, I was able to find L29 easy enough. A large E/W linear feature near the terminus at lunation 6 .4 days. Rima Hyginnus was only about half visible. Tomorrow should be much better. I didn't have my virtual atlas handy so finding other L100 features was difficult. I need to set up the laptop or find a good hardcopy lunar atlas that I can keep at the scope.
Seeing wasn't as good tonight as the other night and I could only reliably see Saturn's largest moon: Titan. Iapetus was dim but usually visible. Rhea and Tethys both appeared briefly when the sky cleared a bit. There must have been some thin clouds that weren't visible to the unaided eye.

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