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194493 OPTOLONG H-ALPHA 7NM CLIP-ON FILTER FOR CANON EOS APS-C CHIP

$289.95
SKU:
194493
Weight:
0.5000 LBS
Shipping:
Calculated at checkout
Quantity:

Product Description

 

H-Alpha 7nm Deep Sky Filter

H-Alpha 7nm filter is the most popular narrowband filter allowing 7nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Best choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details.

Size

  • 1.25"
  • 2"
  • 31mm(unmounted)
  • 36mm(unmounted)
  • EOS-C (clip mount)
  • Customized size's available, please inquire by email 

 

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

  • Optically polished on both sides to ensure accurate λ/4 wavefront and <30 seconds parallalism over both surfaces
  • Ultrasonic wave cleaning substrate with purified water—— cleanup by purified water to remove inpurities and dust effectively

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

  • Consistently stringent quality testing processes—— each filter is tested by spectrophotometer and laser interferometer, testing spectrum and wavefront to ensure filters quality 

  • Optolong spares no effort to assure quality products and service!

  

 

 

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