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Observing >> Double Star Observing

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Bonco
Post Laureate
*****

Reged: 04/17/06

Loc: Florida
Magnification demo new
      #5722567 - 03/09/13 04:17 PM

Last night had transparent skies but not so steady. With my 4 inch f/15, no luck with E or F in the Trapezium and no joy on the "Pup". The 4th star of Sigma Orionis was harder than I expecded confirming unsteady air. So I decided to play with magnification and see the results. Best view of the dim star was with 9mm/166X. Using my favorite 4.8mm Nagler at 312X the star was 100% invisable. Good demonstration that correct magnification for the conditions is paramount for dim doubles.
Bill


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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Magnification demo new [Re: Bonco]
      #5723524 - 03/10/13 08:58 AM

It's dispiriting just how detrimental poor seeing can be to doubles and conversely just how flattering in good conditions. There have been a few nights this past winter where either a 26 or 20mm ocular were about max for stellar clarity before bloating or disappearance became evident.

Pete


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Ed D
Carpal Tunnel
*****

Reged: 04/30/10

Loc: Sunny South Florida
Re: Magnification demo new [Re: azure1961p]
      #5727591 - 03/12/13 08:01 AM

I have a few eyepieces in my case that I sometimes wonder why I have them. Then, a night happens just as you describe and I realize their value and why they're keepers.

Ed D


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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Magnification demo [Re: Ed D]
      #5729287 - 03/12/13 11:01 PM

There is a beauty to low power doubles on those nights. The success I've found is having a backup list for those poor seeing nights that can turn it into something's profitable.

Pete


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