Optolong H-Alpha 7nm 2" (50.8mm) v.2

The H-ALPHA 7nm filter is the most popular narrow-band filter that allows a 7nm bandwidth centered on a 656nm wavelength.

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