Baader 6.5nm Narrowband 2" CMOS Optimized Filter Set - Ha, OIII, SII

Baader 6.5nm Narrowband 2" CMOS Optimized Filter Set - Ha, OIII, SII

This Baader Planetarium narrwoband filter set is CMOS optimized with Life-Coat, a hard coating that will not peel, flake, or physically degrade and will withstand repeated cleaning with fine optical cleaning equipment. This coating is so durable that Baader is confident it will last the life of the filter, even in the most extreme environments.

Included in the filter set are three precision-grade 2" threaded filters: an H-alpha filter, an SII filter, and an OIII filter. With 6.5 nm FWHM, these filters from Baader are recommended for extremely fast optical systems from f/10 to f/3.5, like the Celestron RASA astrographs. The filters are designed to allow for 1:1:1 exposures. This matches the typical CMOS quantum efficiency and s/n ratio.

Not only do the filters have sealed coating edges with the Life-Coat, but they are also hard coated with Reflex-Blocker and planoptically polished. All of the edges are blackened for increased contrast and eliminate any reflection that would come from light falling on the edge of the filter. The filters are also equipped with a filter-lead-side-indicator in the form of a frontside outer rim. The filters are optimized for CMOS cameras, but they work great with CCD cameras as well.

Baader 6.5nm Narrowband 2" CMOS Optimized Filter Set Features

• Transmission Ranges: H-alpha, OIII, and SII

• Filter Thickness (w/out glass) 2 mm

• Half Bandwidth: 6.5 nm

• Central Wavelenth: 656.3 nm, 500.7 nm, 671.7 nm

• AR-Coating: Reflex Blocker hard coated and planoptically polished

• Filter Size: 2"

• Threaded: Yes

• Usage: CMOS, CCD, H-alpha, OIII, SII

• Mounted: Yes

• Filter Type: Narrowband

• FIlter Shape: Round

• Feature Highlight: CMOS-Optimized with Life-Coat