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Baader 3.54nm f2 Ultra-Highspeed 2 CMOS Optimized Filter Set - Ha OIII SII
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Baader 3.5/4nm f/2 Ultra-Highspeed 2" CMOS Optimized Filter Set - Ha, OIII, SII

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SKU: BAD-FCSETHSU-2
$1,257.00

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Baader 3.5/4nm f/2 Ultra-Highspeed 2" CMOS Optimized Filter Set - Ha, OIII, SII

Included in the filter set are three precision-grade 2" threaded filters: an H-alpha filter, an SII filter, and an OIII filter. With 3.5nm and 4 nm half bandwidth to harmonize the exposure time of the H-alpha with the OIII and SII filters, these filters from Baader are recommended for extremely fast optical systems from f/3.4 to f/1.8, 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. The filters enable the high contrast, even in high levels of light pollution, minimize the size of the starts, and allow the finest details of nebulas accessible.

This Baader Planetarium f/2 ultra-highspeed 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.

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 well with CCD cameras too.

Baader 3.5/4nm f/2 Ultra-Highspeed 2" CMOS Optimized Filter Set Features

  • Transmission Ranges: H-alpha, OIII, and SII
  • Filter Thickness (w/out glass) 2 mm
  • Half Bandwidth: H-alpha: 3.5 nm, SII and OIII: 4 nm
  • Central Wavelenth: 653.3 nm, 500.7 nm, 671.7 nm
  • AR-Coating: Reflex Blocker hard coated and planeoptically 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