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Gerard,
Yeah,
I'm finding the narrow bandwidth of the MiniSHG makes the difference.
The commercial CaK filters (around 2A) and the usual CaK double stack mod (around 1A) just don't cut it when trying to image filaments.
"The (filaments) appear ghostly, transparent, extremely faint" are some of the descriptions. Certainly not as well defined and contrasty as the SHG.
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