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Petr,
The resulting bandwidth of the etalon/ blocking filter combo is only around 0.7 Angstrom (0.07nm).
The blocking filter on its own is about 8-10 Angstrom (0.8-1nm).
So the combo would be far too narrow for effective DSO work, but in THEORY the blocking filter COULD be used for extreme narrow band work.
Also, the small sizes of the available blocking filters (<12mm diameter) would certainly limit the field of view....
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