Return to the Cloudy Nights Telescope Reviews home page


Observing >> Double Star Observing

Pages: 1
Rolex2
member


Reged: 09/05/13

Micrometer eyepiece new
      #6169987 - 11/01/13 10:50 AM

Is it true these eyepieces are no longer available? What eyepieces are used for double star separation? Rowland

Post Extras: Print Post   Remind Me!   Notify Moderator  
Michael Rapp
Post Laureate
*****

Reged: 04/27/04

Loc: Dickinson, TX
Re: Micrometer eyepiece new [Re: Rolex2]
      #6170039 - 11/01/13 11:18 AM

Hi Rowland,

I'm a beginning double star observer and I also asked this question. What I found is that micrometers are rare and Van Skye Engineering has ceased production of them (alas, ceased to exist as well).

I stumbled upon some articles in S&T that use the Celestron Microguide Eyepiece and Meade Reticle Eyepieces for DS measurements. (The Celestron eyepiece is out of production, but I believe the Meade one is still available.)

See Observing Double Stars for Fun and Science, S&T Feb 1999 (Also partially available here: http://www.skyandtelescope.com/observing/objects/doublestars/3304341.html?pag...

and Double-Star Measurement Made Easy, S&T July 2000.

It does look like fun....but I'm still honing my star-hopping skills before I start seeking out doubles for measurement. While simple, it is not a quick process. One must repeat one's measurements many, many times over several nights to minimize error.

I've been enjoying adding double stars to my observing. It is refreshing to stare at the center of the field of view for once.


Post Extras: Print Post   Remind Me!   Notify Moderator  
R Botero
Pooh-Bah


Reged: 01/02/09

Loc: Kent, England
Re: Micrometer eyepiece new [Re: Michael Rapp]
      #6170210 - 11/01/13 12:57 PM

Hi Rowland

The Japanese maker of the micro-guide eyepieces ceased production (altogether) after the earthquake/tsunami of 2011. Despite this, some vendors still have some in stock (Teleskop Service ) and these eyepieces do come up in the secondary market from time to time. I acquired mine that way and they are an excellent tool for beginners into double observing like myself.

Michael has already cited some very interesting articles. I also thoroughly recommend reading Bob Argyle's Observing and Measuring Double Stars by Springer. There is a whole chapter on using the micro-guide eyepiece.

Good luck and enjoy!

Roberto


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Micrometer eyepiece new [Re: R Botero]
      #6170642 - 11/01/13 04:50 PM

If you are interested in measuring for publication, I might suggest video capture or ccd capture as alternative to either micrometers (expensive if found) or eyepieces. But if you are doing this only for your own pleasure, then a Meade or Celestron eyepiece is great and, in fact, can be used for measures that can be published. I don't know how hard it is to find one, but I bet you could turn one up in the used market.

My suggestion to anyone interested in measuring is to look through the JDSO and see all the diverse ways amateurs are measuring doubles and making valuable scientific contributions.

Ed


Post Extras: Print Post   Remind Me!   Notify Moderator  
Rolex2
member


Reged: 09/05/13

Re: Micrometer eyepiece new [Re: Ed Wiley]
      #6171544 - 11/02/13 07:55 AM

Thanks to Michael, Roberto and zed.
Thanks for great information. Last night I read articles mentioned and looked at the books on Amazon. Not at the point getting technical, but I have all winter to study techniques. I found that a Meade sells a astrometric eyepiece. Looks like the micrometer eyepiece. I will order the eyepiece today plus Argyle's book...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Micrometer eyepiece new [Re: Rolex2]
      #6172736 - 11/02/13 10:36 PM

Happy measures!
Ed


Post Extras: Print Post   Remind Me!   Notify Moderator  
Karl Fabian
super member
*****

Reged: 11/02/11

Loc: Illinois
Re: Micrometer eyepiece new [Re: Rolex2]
      #6172748 - 11/02/13 10:44 PM

Meade still makes the 12mm illuminated Astrometric eyepiece. I bought one a year ago and they are still available for about $80. The reticle is similar to the no longer available Celestron microguide, so Double star measurements can be made on the micometer scale and PA determined by using the drift method to the outer degree scale.

Clear skies,
Karl


Post Extras: Print Post   Remind Me!   Notify Moderator  
drollere
Pooh-Bah
*****

Reged: 02/02/10

Loc: sebastopol, california
Re: Micrometer eyepiece new [Re: Karl Fabian]
      #6176048 - 11/04/13 06:48 PM

i think the celestron is superior to the meade, both optically and in the clarity of the etched measurement. (i've used both.) always check the used market (OPT sells some "pre owned" equipment, and of course there's astromart).

personally i think video would be the way to go, provided you like computer processing as the way to spend most of your time.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Micrometer eyepiece new [Re: drollere]
      #6176411 - 11/04/13 10:02 PM

I agree with Bruce, especially if you objective is to make publishable measures. There are some limitations, for example, its hard to obtain good video when the difference in magnitude is greater than about 2.5 mags. Processing does take time but the results are good and the best (IMO) processing software is free.

Ed


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astrodj
professor emeritus
*****

Reged: 08/24/11

Loc: Missouri
Re: Micrometer eyepiece new [Re: Rolex2]
      #6176591 - 11/04/13 11:37 PM

Here is an interesting primer for some doubles worth tracking within one lifetime (that's all we get, right?).

http://admin.prairieastronomyclub.org/dblstar1.htm

I realize your post was about eyepieces, but this is kind of apropo for some interesting short term targets.

Be sure to check out each of the five parts of the article.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astrodj
professor emeritus
*****

Reged: 08/24/11

Loc: Missouri
Re: Micrometer eyepiece [Re: Astrodj]
      #6176618 - 11/04/13 11:56 PM

A better link:

http://www.prairieastronomyclub.org/resources/deep-sky-observing/double-stars...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
2 registered and 2 anonymous users are browsing this forum.

Moderator:  PJ Anway, Rich (RLTYS), rflinn68 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 498

Jump to

CN Forums Home




Cloudy Nights Sponsor: Astronomics