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Old 27-08-2013, 11:15 AM
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RickS (Rick)
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Originally Posted by naskies View Post
The 3 nm also rejects the NII signal too, but it's picked up by the 5 nm. The NII signal can be substantial depending upon the object (e.g. some of Bert's NII images).
Good point, Dave. For objects with a lot of NII you'd need longer exposures with a 3nm Ha.
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