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Equipment Discussions >> Reflectors

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cloud_cover
professor emeritus


Reged: 08/17/10

Loc: Restaurant at the End of the U...
Howie Glatter Holographic Attachment?
      #5650280 - 01/29/13 01:05 PM

I've finally gotten round to installing the optics into my new scope but the centering of the secondary frustrates me in that I'm not sure its actually centered in my focuser. Now I've got teary eyes from squinting down a sight tube.
Do you folks think the Howie Glatter Holographic Attachment that produces a grid pattern over the secondary is a good idea? I'm thinking of getting the BLUG anyway
Thanks for your thoughts!


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Jason D
Postmaster
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Reged: 10/21/06

Loc: California
Re: Howie Glatter Holographic Attachment? new [Re: cloud_cover]
      #5650576 - 01/29/13 03:28 PM

Check the information in this thread
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/reflectors/Nu...
Jason


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stratocaster
sage
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Reged: 10/27/11

Re: Howie Glatter Holographic Attachment? new [Re: Jason D]
      #5650732 - 01/29/13 04:51 PM

You may also want to see this. I had the same question on using the holographic attachment.

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Mark Peterman
super member


Reged: 08/07/12

Loc: Texas
Re: Howie Glatter Holographic Attachment? new [Re: Jason D]
      #5650735 - 01/29/13 04:54 PM

While I can't answer your question, I have had the same experience.

What I found easiest is when you can center the secondary under the focuser while the primary mirror is out of the scope. It just makes things easier to see and what you see makes more sense. If you don't want to remove the primary, simply hang a white piece of paper behind the secondary so that it blocks the reflection from the primary.

Doing it this way, there is no need for a white piece of paper on the opposite side of the focuser. The dark contrast of the tube and the white reflection of the paper in the secondary mirror makes it clear as night and day to see how centered and round the secondary is.


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: Howie Glatter Holographic Attachment? new [Re: Mark Peterman]
      #5651062 - 01/29/13 08:03 PM

I don't have Howie's holographic attachment so I can't help you there but I"m wondering if you have tried pulling your sight tube as far back in the focuser as possible? I have to set mine that way before I can see the edges of the secondary, once at that point its easy to center it.

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