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Deep Sky Filters

4 Items

Optolong 1.25" Filter Set with H-Alpha, SII, and OIII Filters - HASIIOIII-125

SKU: OTL-HASIIOIII-125
  • Filter Type: Narrowband Set
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$465.00

Optolong 2" Filter Set with H-Alpha, SII, and OIII Filters - HASIIOIII-200

SKU: OTL-HASIIOIII-200
  • Filter Type: Narrowband Set
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$720.00

Optolong 31mm Unmounted Filter Set with H-Alpha, SII, and OIII Filters - HASIIOIII-31U

SKU: OTL-HASIIOIII-31U
  • Filter Type: Narrowband Set
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$540.00

Optolong 36mm Unmounted Filter Set with H-Alpha, SII, and OIII Filters - HASIIOIII-36U

SKU: OTL-HASIIOIII-36U
  • Filter Type: Narrowband Set
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$557.00