Thread: Solar AR's, filament and proms in Ha 27 Jan 2019
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Old 02-02-2019, 09:43 AM
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Merlin66 (Ken)
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Location: Junortoun Vic
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Re double stacking a PST....
The front 40mm etalon is available (SME 40)
https://www.highpointscientific.com/...-filter-sme-40
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