Optolong H-Alpha 7nm Filter - 36mm UnmountedLatest Version - Higher contrast and coating enhancements.The Optolong H-Alpha 7nm filter is the most popular narrowband filter in the range allowing 7nm bandwidth of light centered on a wavelength of 656nm through. This filter does an excellent job of blocking out other wavelengths of light specifically artificial sources of light pollution including mercury vapour, high and low pressure sodium vapour lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow). This filter can help increase contrast and reveal subtle nebula details in your images. Suitable for imaging faint emission nebula in the H-Alpha line even in full moonlight or areas of high light pollution. Warning - Optolong filters are not designed to be used for solar observation. Do not look at the sun through this filter as it will cause permanent eye damage.
Transmission Chart
Red Line: H-alpha, 7nm centred at 656.3nm. Blue Line: SII, 6.5nm centred at 671.6nm. Green Line: OIII, 6.5nm centred at 500.7nm
Technical Data
Coating Parameter
Filter Cell
Sample Images
About Optolong While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolong is a division of Yulong Optics Company, a high tech company specializing in optical filter design and production. Their products include bandpass filters, flourescence filters, edge filters, longpass and shortpass filters, beam splitters, anti-reflection coatings, optical mirrors and, of course, astronomical filters. |
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