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Lunt dual pressure tuner question

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#1 ion

ion

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Posted 24 May 2022 - 09:45 AM

A question for those fortunate enough to enjoy dual pressure tuners.
I have a double stacked Lunt 60 with external primary tilt etalon
and a pressure tuned secondary. The primary is always set to have
no extra tilt while the secondary requires periodic tweaks to
account for weather and altitude excursions. Does it work this way
for dual pressure tuners? Can the primary always be set to something
(like minimal pressure) and left alone while only the secondary
needs occasional tuning? Thank you

#2 slavicek

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Posted 24 May 2022 - 04:57 PM

I think you answered your question yourselves:

"while the secondary requires periodic tweaks to account for weather and altitude excursions."

If you use two pressure tuners you will have to tweak both, to account for pressure differences due to weather. Besides, over time, the air under pressure might leak out of the etalon. Therefore, I always "depresurize" both etalons at the end of my observing session. My 2c. 



#3 ion

ion

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Posted 24 May 2022 - 06:36 PM

I guess that was a dumb question, apologies. Maybe food for thought on the
next innovation from Lunt. I'd like to see less optical redundancy and bulk
in the double stacked pressure tuners, and perhaps improved performance.
How about a slot where one could insert another thin and lightweight slighty
tiltable etalon module in between the collimating lens and pressure tune
chamber? Less glass, less mass, less cost, easier to tune.


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