Baader Narrowband CCD 3 Filter Set (Full Frame CCD) Size::2" The Baader filters pass this

The Baader filters pass this test with no coating degradation

Neck strap

The Sky-Watcher Skyliner 300P Flextube Dobsonian

Accepts Standard 1

Baader Narrowband CCD 3 Filter Set (Full Frame CCD) Size::2" The Baader filters pass thisCCD Narrowband Filterset 1. 25" or 2" 2mm glass thickness for full frame CCD, consisting of 3 filters: H Alpha 7nm OIII 8. 5nm SII 8nm Baader's Premium Narrowband CCD filters are proven to deliver the absolute highest contrast deep sky images in H Alpha, Oxygen III, and Sulfur II, take advantage of the absolute shortest exposure times available. Their ultra narrow bandwidths have extremely high transmissions, while completely rejecting light pollution