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Old 18-06-2013, 06:13 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
Hmmmm
With an 8" aperture, any filter will severely reduce the light throughput..
A OIII is usually recommended for Planetary neb, the Hbeta isn't worth the effort (visually).
Depending on your light pollution a multi-band LPR may be a better bet.
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