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Optolong H-Alpha 7nm 1.25" (31.8mm) v.2

US$ 174.71

Availability: Out of stock

Short Description

Bester H-alpha-Linienfilter für die Astrofotografie von Emissionsnebeln mit höchstem Kontrast und der Wiedergabe zartester Nebeldetails.

♦ schmalbandiger (<=7 nm) Linienfilter für wichtige Nebellinie
♦ bevorzugt für CDD-Kameras mit Full-Frame-Transfer-Technik
♦ 2 mm dick und somit homofokal mit vielen anderen Filtern von Optolong
♦ Interferenzfilter
♦ feinoptisch poliert
♦ mehrschichtig hartvergütet - reflexfrei und weitgehend kratzfest



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  • CWL(centre wavelength): 656.3nm
  • Fwhm: 7nm
  • Tpeak: <85%
  • Coating Wavelength: 300-1100nm
  • Optical Denisity: OD3
  • Surface Quality: 60/40
  • Transmitted Wavefront RMS: λ/4
  • Parallelism (arcsec): 30s


Reference Spectrum


Manufactruring Technique

  • Fine-optically polishing for double-sides—— Ensure accurate λ/4 wavefront and <30 seconds parallalism over the both surfaces
  • Ultrasonic wave cleaning substrate with purified water—— Cleanup by 13 purified water tank to remove inpurities and dust effectively

  • Iro source assisted coating—— For durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.

  • Constantly stringent quality testing processes—— Each filter was tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product


Package Details

  • Silver Cardboard Box
  • Plastic PP Case
  • Imported high pressure EVA case lining

Additional Information

Additional Information

NameOptolong H-Alpha 7nm 1.25" (31.8mm) v.2
Diameter1.25" (31.8mm)