Quote:
Originally Posted by PeterM
Thanks Peter certainly helpful.
Which rings do I use? The 32mm or 34mm they sent me or is it remove old ones and just overlay new ones to determine?
I wondered if one ring might be 32mm and the other 34? If so then I have a spare set I could send to Phil?
Thanks again and a Merry Christmas to you!
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Sorry, as I said, it's been a while since I had one in pieces.
You should be able to determine the location and sizing from the existing rings...take note of the orientation, i.e. don't mix up their positions.
P.S.
Pressure tuned etalons work by increasing the pressure, hence refractive index of the air between the etalon plates. O-ring wear will cause the inner chamber to drift back to ambient pressure, hence go "off band" as air slowly leaks from the chamber.