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Equipment Discussions >> Eyepieces

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CelestronDaddy
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Reged: 08/22/09

Double Star EP Recommendations new
      #5644284 - 01/26/13 12:03 PM

I enjoy double stars and I would like recommendations on EP's to use with my 6SE. Any information would be appreciated... Thanks, Tony

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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: Double Star EP Recommendations new [Re: CelestronDaddy]
      #5645059 - 01/26/13 08:17 PM

Pretty much all eyepieces will be sharp on axis, or close to on axis.
Ergo, the eyepiece you are looking for is an eyepiece that will:
--give you enough power to split the doubles you're examining.
--have a sharp enough image.

Since doubles vary a lot in separation, double stars may be viewed at low, medium, and high powers.
In your scope, with a focal length of 1524mm,
you could use eyepieces of 30mm, 15mm, and 10mm and a good 2X Barlow for the nights when seeing is superb.
As for type, it will depend on your pocketbook, as good eyepieces can be as little as $30 each or as much as $1000 each.
50 degree apparent fields will generally cost you the least. Good 65-70 degree eyepieces will cost more. Some 82 degree eyepieces can be had for the same prices and upwards to $700 or so.
And 100 degree eyepieces can be had for mega$.

There is no such thing as a specific "double star eyepiece", so you'll want to have your eyepieces be good for deep sky, planets, moon, and double stars.
The good news is that, at f/10, just about all eyepieces will do you well, whether TeleVue, Baader, Explore Scientific, Astrotech, pentax, or...........


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CelestronDaddy
scholastic sledgehammer
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Reged: 08/22/09

Re: Double Star EP Recommendations [Re: Starman1]
      #5645088 - 01/26/13 08:33 PM

Don,
Thanks for the reply and information... Tony


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Jon Isaacs
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Double Star EP Recommendations new [Re: CelestronDaddy]
      #5645454 - 01/27/13 04:18 AM

Quote:

Don,
Thanks for the reply and information... Tony




Just to add my two cents: Don't be afraid to crank up the magnification to split close double stars. The 50X/in limit is based on the matching of the size of the Airy disk to the resolution of the retina, there is no hard and fast theoretical limit, let your eye tell you what is the best magnification.

For a 6 inch scope, on a night when the seeing is excellent and the scope thermal stable, you might want to use as much as 450x-500x on a Dawes limit, equal magnitude double.

Jon


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CelestronDaddy
scholastic sledgehammer
*****

Reged: 08/22/09

Re: Double Star EP Recommendations new [Re: Jon Isaacs]
      #5645691 - 01/27/13 09:45 AM

Quote:

Quote:

Don,
Thanks for the reply and information... Tony




Just to add my two cents: Don't be afraid to crank up the magnification to split close double stars. The 50X/in limit is based on the matching of the size of the Airy disk to the resolution of the retina, there is no hard and fast theoretical limit, let your eye tell you what is the best magnification.

For a 6 inch scope, on a night when the seeing is excellent and the scope thermal stable, you might want to use as much as 450x-500x on a Dawes limit, equal magnitude double.

Jon




Jon - Good information and thanks for taking time to reply... Tony


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