Double stacked PST etalons anyone?

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Valery
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Double stacked PST etalons anyone?

Post by Valery » Sun Jan 04, 2015 11:04 pm

Has anyone successfully stacked two Ha PST etalons? If yes, what the results?

I got now two of them in hands and I don't know is it worth to unite them (need to make an adapter between
two of them).

Thanks,


Valery.
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marktownley
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Re: Double stacked PST etalons anyone?

Post by marktownley » Sun Jan 04, 2015 11:25 pm

Hi Valery, yes, this is something i've done. It does work, in theory, but the problem I had that i could never really deal with repeatably was that of reflections between the 2 etalons. The obvious answer is to tilt the etalons to shift the reflection, but, as you know, doing this blue shifts the etalons response, so this isn't a solution. I worked with this for a while, looking at things like using a polarizing filter between the 2 etalons to kill the reflection with limited success. In the end the project kinda dwindled away. Looking I have some results on my website http://brierleyhillsolar.blogspot.co.uk ... m-3rd.html link to big version here https://farm8.staticflickr.com/7303/943 ... 590c_o.jpg

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Re: Double stacked PST etalons anyone?

Post by Merlin66 » Mon Jan 05, 2015 12:59 am

Valery,
I've used a PST etalon double stack...the "fiddly" tuning (and rotation) of the etalons was more hassle than I was prepared to accept.
I do have a special PST/PST adaptor - drawing available
The PST etalon seems to work well double stacked with an upfront SM60
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Valery
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Re: Double stacked PST etalons anyone?

Post by Valery » Mon Jan 05, 2015 5:30 am

Thanks, friends. You save my time and nerves. :)

Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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