Optolong H-Alpha 3nm CCD Filter

• Suitable for telescopes and lenses with focal ratios of f/3 and lower
  Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 656 nm

The Optolong H-Alpha 3nm CCD Filter corresponds with the RGB channel, allowing imagers to process Hubble images with post-processing astrophotography software. Optolong uses a multi-layer, anti-reflection coating on the filter. It uses a non-cementing optical substrate coating, applied through precision Ion-based deposition, providing durability and resistance to scratching. It also provides stability on the central wavelength so there is no deviation depending on temperature change. Their planetary rotation system gives precision and homogenous coatings to ensure high-value pass-band transmission and off-band optical density.

The Optolong H-alpha filter is narrowband and allows a 3nm bandwidth of light, centered on a 656nm wavelength, through. This popular type of filter is perfect for those looking to have better contrast and the ability to capture subtle nebula details.