— The Oxygen III Filter — The Hydrogen Alpha Filter — The Hydrogen Beta Filter — The Sulfur Filter

Designed to minimize the consequences of urban light pollution, these narrow band filters obtain good deep sky images and perform imaging in the same wavelengths as professional astronomers. Narrowband interference filters capture emission line images with much less pollution noise than conventional filters. They have the ability to elicit the delicate structure of emission objects such as planetary and deep-sky emission nebulae.

Features

• Precision Wavelength Selection
• Rejects all other wavelengths (including urban light pollution)
  
• Produces superior contrast
  
• Standard 1.25” filter ring mount for ease fo use
  
• Designed for CCD Camera sensitivity
  
• Selection include many of the filters previously unavailable to the amateur astronomer including many of the bands used by Hubble
  
• Same high quality as demanded by professional scientist

Amateur astronomers can now:

• Virtually eliminate interference from skyglow caused by light pollution, natural atmospheric emmission or a bright moon
  
• Prevent or greatly reduce bright star overexposure problems where faint background nebulousity is being captured using very long exposure times
  
• Elicit exotic complex structures of nebula and planetaries by isolating light from different emission lines in separate exposures which are then assigned different colors

The Oxygen III Filter is designed for imaging emission nebula. It isolates the bands of doubly and triply ionized oxygen emitted by planetary and emission nebulae while blocking other wavelengths. The contrast between the black background of space and the OIII light allow for views of the Veil, Ring, Dumbbell and Orion nebulae. The Hydrogen Alpha Filter is designed for non-solar imaging and is used to image deep-sky objects that emit in the H-alpha passband. It is too wide for solar-prominence viewing, but is ideal for deep sky.

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The Hydrogen Alpha Filter is designed for non-solar imaging and is used to image deep-sky objects that emit in the H-alpha passband. It is too wide for solar-prominence viewing, but is ideal for deep sky.

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The Hydrogen Beta Filter isolates only the Hydrogen-beta line of the spectrum while blocking the rest of the overall spectrum of light. It is designed specifically for viewing extremely faint nebulae with hydrogen beta emission such as the California Nebulae in Perseus and the Horsehead in Orion.

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The Sulfur Filter is designed to cut the glare of urban light pollution allowing for views of Saturn and Jupiter. Images of the Ring Nebula M57 and the Eagle Nebula M16 can be obtained by using this filter with the Hydrogen
alpha and the Oxygen III filters.

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