Ebay Omega

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Wah
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Ebay Omega

Post by Wah » Tue Dec 10, 2013 10:16 am

Ebay Omega <0.1nm Halpha filter on sale!

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 1249wt_898


I wonder if the thicker one can be used as a large blocking filter for other solar telescopes :? :? :? :? :woohoo: :woohoo: :woohoo:

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Re: Ebay Omega

Post by solarchat » Tue Dec 10, 2013 1:21 pm

ebay ads are directly embeddable in posts on solar chat for future reference. Check the toolbar above the message posting area.
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Re: Ebay Omega

Post by swisswalter » Tue Dec 10, 2013 3:25 pm

Hi Wah

I had them here. I do not remember that on of the pair was thicker then the other. Where have you your information from ?
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

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Re: Ebay Omega

Post by Wah » Tue Dec 10, 2013 3:27 pm


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Re: Ebay Omega

Post by swisswalter » Tue Dec 10, 2013 3:48 pm

Hi Wah

thank you very much for the thread reference. So there are two different types on the market. Now I don't wonder any more, why we get different results from the Omega Halpha filters
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: Ebay Omega

Post by Wah » Wed Dec 11, 2013 3:33 am

It seems nobody can tell if the thicker one can be used as a cheap blocking filter.

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Re: Ebay Omega

Post by marktownley » Wed Dec 11, 2013 6:44 am

It seems nobody can tell if the thicker one can be used as a cheap blocking filter.

Missed this post, sorry Wah! I have bought 2 different sets of these off ebay and can confirm that certainly the ones I have cannot be used as blocking filters.
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Re: Ebay Omega

Post by Wah » Wed Dec 11, 2013 7:14 am

Do you have idea why? Is that safety issue or bandwidth issue? :huh:

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Re: Ebay Omega

Post by sullij1 » Sat Dec 28, 2013 7:10 pm

Hi Wah,

I own alll of the Omega Ha offerings, As I understand it, the thicker one is actually Omegas attempt at an etalon.. So the thick one "is" the etalon in the Omega system.

"The thin one is the blocking filter for the Omega etalon". As I understand it, blocking filters are manufactured for FSR of the etalon, each manufactuer FSR may be slightly different(dependent on etalon spacing). For example, Omega blocker may not work on a Coronado etalon because of FSR. So "bandwidth" may be an issue."

Link to Colin's paper:

http://www.designerinlight.com/solar/Et ... clePt1.pdf

See title THEORY and fig 4,5,and 6.
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