Re: (IAAC) Markarian 205 - 8inch F/10

>In fact, generally the only NEGATIVE effect of using narrow-band
>filters (aside from false color distractions) is image darkening!
The only caveat to this would be a case where any object had a significantly bright emission feature which was excluded by a particular filter's bandpass. Are there any common examples of this folks know of - maybe certain types of emission features being darkened relative to the background by an H-beta, or by some of the "custom bandpass" filters? Just curious...

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