Optolong H-Alpha 7nm 36mm

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

Specifications

• 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