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Baader OIII 2 Narrowband CMOS Optimized 6.5nm Filter OIII 2 Narrowband Filter
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Baader OIII 2" Narrowband CMOS Optimized 6.5nm Filter

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SKU: BAD-FCOIIIN-2
$302.00

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Baader OIII 2" Narrowband CMOS Optimized 6.5nm Filter

Baader Planetarium has designed this 2" OIII precision-grade filter to provide astrophotographers an excellent complement to their imaging setup. This Baader Planetarium OIII narrowband filter is CMOS optimized with Life-Coat. This coating is a hard coating that will not peel, flake, and will not physically degrade even in the most extreme weather conditions. This coating is also designed to 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.

With 4 nm FWHM, this filter from Baader is highspeed and recommended for optical systems from f/10 to f/3.5. The filters are designed to allow for 1:1:1 exposures. This matches the typical CMOS quantum efficiency and s/n ratio. OIII narrowband filters isolate just the two doubly-ionized oxygen lines emitted by planetary and emission nebulae and block the rest of the overall spectrum of light. This results in extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, and other objects.

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 and also work great with CCD cameras.

Baader Narrowband 2" CMOS Optimized Filter Features

  • Transmission Ranges: OIII
  • Filter Thickness (w/out glass) 2 mm
  • Half Bandwidth: 6.5 nm
  • Central Wavelenth: 500.7 nm
  • AR-Coating: Reflex Blocker hard coated and planoptically polished
  • Filter Size: 2"
  • Threaded: Yes
  • Usage: CMOS, CCD, OIII
  • Mounted: Yes
  • Filter Type: Narrowband
  • FIlter Shape: Round
  • Feature Highlight: CMOS-Optimized with Life-Coat