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that looks like an interesting filter Sara but it is slightly alarming to see the qualifying text
'Wide Angle Color Shift: You will experience a purple color shift in the left and right portions of your images when using this filter with a full-spectrum camera and wide-angle lenses. The colour shift is most prominent at focal ranges 24mm and under'
That sounds rather hard to process away if it occurs selectively in parts of the image, rather than across the whole image. Of course wide angle lenses are most often used for Milky Way shots so I would guess that many people will encounter this problem?
Alternatively STC do a 'duo narrowband' clip in filter....
BTW the Kolari clip in filters are a nice product in terms of day-to-day use - I use an IR version on a modified camera for terrestrial photography - I just don't know anything about the astro filter.
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