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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12581
Loc: Cumberland, R I , USA42N71.4W
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Re: 100 Hercules at 10x
07/16/08 06:41 AM
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Out again last night with several binoculars, 100 Herc became a target. I had a friend over so we tried a few binocs. I saved the 15x70s for last.
We started with the Vixen Foresta 7x50. I could tell which star was 100 Herc only because I knew its location, but neither of us could even see elongation in the pair. I would say perhaps 100 Herc looked like it might be slightly misshapen in a 7x50, but if you didn't know it was a double you would not see it as anything more than a single star.
Next we tried the Celestron Regal LX 8x42. At least in the 8x42, we both could see elongation. However on 2 out of 4 guesses, we guessed wrong on the orientation of the pair. The Regal is very close to 8x, it's actually 8.1x. So at 8.1x we were able to guess at the orientation of the pair. That's an apparent size of 115 arcseconds. I've had 4 other binocular observations of record where I've been able to declare orientation of a pair at apparent sizes between 113 and 118 arcseconds, so this fits right in.
Both the Vixen 7x50 and the Regal 8x42 are two of the best binoculars I've tested for resolution, in the top 10 of all binoculars I've ever tested.
At this point we took a look thru the 15x70s and could see which guess for orientation was right and which was wrong. the 15x70 allowed seeing the split easily, but the stars were not focused nearly as tight.
Finally, I tried with my Fujinon 10x50. This is actually 10.4x.
My friend was not able to confirm a split with the 10x50, but did see two components. With very careful focusing and careful attention to detail, I was able to see the split between the two components. That's a very good observation for me, an apparent resolution of 148 arcseconds. I can count the number of times I've gone under 150 on one hand.
edz
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