This product is registered by Cytron Japan Co., Ltd..
About This Product
The Sightron Comet BP (Comet Bandpass) filter is an interference filter that transmits the wavelength range near the four main emission lines emitted by celestial bodies, Hα, Hβ, OIII, and SII, and also transmits the emission lines near CN, C2, and C3 of the comet's nucleus and tail, while cutting off the other wavelength ranges. It can be used as a light pollution cut filter to improve the contrast of low-altitude comets, reflection nebulae, galaxies, star clusters, etc. that are obscured by light pollution.
Product features
■Transmits the bright line of a comet
It transmits wavelengths near the four main emission lines of celestial bodies, Hα, Hβ, OIII, and SII, and also transmits emission lines near CN, C2, and C3 of comet nuclei and tails, and cuts out other wavelengths, making comets and nebulae visible even in light-polluted areas. In addition, since it transmits light from celestial bodies in a relatively well-balanced manner from short to long wavelengths, the color balance of stars and nebulae is less likely to be disrupted.
■Reliable domestic quality, synthetic quartz glass used
A multilayer film is deposited on both sides of a highly precisely polished synthetic quartz glass substrate using IAD (ion assisted deposition) coating by a major Japanese deposition manufacturer. The membrane surface boasts high density, homogeneity, and stability.
■Highly versatile 48mm, 52mm diameter, American size
We offer highly versatile filter thread diameters of 48mm and 52mm, as well as American sizes. It can be used with many commercially available telescopes.
■American size
It can be easily used by attaching it to the American size sleeve of astrophotography cameras such as Player One and ZWO. It is also ideal for popular TV viewing. The filter frame uses a newly designed large diameter type. Compared to our conventional frame, vignetting is less likely to occur. From October 1, 2024, the American size screw pitch has been changed to metric threads and has become "Comet BP Filter+ (Plus)".
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