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The reason for the request was to find suitable mono, fast frame cameras for use with spectroheliographs....
We need small pixel, hi resolution to image the various absorption bands in the solar spectrum then extract a "line scan image" to combine into a full disk scan of the sun in the selected wavelength.
This way you can safely image the sun not only in Ha but Mg, Fe, Na - in fact any wavelength you want! Try doing that with a commercial solar filter.
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