Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)
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The Bearclaw Nebula HDW2, Scott Tucker
The Bearclaw Nebula HDW2
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The Bearclaw Nebula HDW2

Getting plate-solving status, please wait...
The Bearclaw Nebula HDW2, Scott Tucker
The Bearclaw Nebula HDW2
Powered byPixInsight

The Bearclaw Nebula HDW2

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Description

Wanted to try some very narrowband at a longer focal length.  I did some testing with a camera lens and the Antlia 2.5nm filters, which they recommend using at f/3.5 or slower, and you do start to lose something below f/4, but they still work quite well.  This is at f/3.6 with a 10" quartz mirror Newtonian I made.

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The Bearclaw Nebula HDW2, Scott Tucker