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Autocollimator
Additional Desiccant Cap Refill - 20 Pack sold separately
via the quick-release saddle
The CASECPC8 case fits the above telescopes
Sized specifically for the Celestron 11" Classic corrector plate
CXB (formerly Astrodon) 3nm Narrowband NII Filter (Nitrogen II) Off Axis Guider Autocollimator3nm NII Filter, center wavelength of 658. 4 nm What about NII and H a? This is a bit complicated. It is not well known that most H a filters pass both H a and NII. H a emits at 656. 3 nm and NII emits most strongly at 658. 4 nm (and weakly at 653. 8 nm). These are very close together spectrally. Thus, most H a filters are wide enough (e. g. 4. 5 nm bandwidth and wider) to pass both emission lines as shown for the older CXB (formerly Astrodon) 6 nm
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