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Etalons .. ?
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23-04-2014, 05:16 PM
Merlin66
(Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,906
Peter,
No.
Both Coronado and Lunt still use air-spaced etalons.
The air gap is around 0.7mm for Ha which gives a bandwidth of 0.7A and a FSR around 10A.
Merlin66
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