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Old 04-03-2019, 07:41 PM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,030
Chris,
The term SCT threw me....
There are also bi and tri wavelength filters designed as full aperture SCT filters.
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