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

Condition

This is a Like New Baader 6.5nm filter set in excellent, pristine, perfect condition.  The previous owner brought in a number of "used" items that turned out not to be used at all, and we think that he never used this one either - these appear to be completely untouched.  Save over TWO HUNDRED DOLLARS off of a brand new set.  

They come in their original jewel cases.  

Description

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

Specifications