SVBONY Telescope Filter H-Alpha 7nm 2 inches Filter Narrowband Astronomical Photographic CCD Filter Color Filter Set for Deep Sky Photography

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About SVBONY Telescope Filter H-Alpha 7nm 2 Inches Filter

H-Alpha is 656nm mainly through the high permeability of the spectrum, and 656nm spectrum of the color presented by the red-based, 300-1100nm cut-off depth to get the details of the launch nebula richer. Extremely narrow bandwidth allows only the 656nm band to pass through the filter, can effectively cut off the artificial light Na lamp and Hg lamp interference to make the transmission line through, so as to improve the nebula contrast. With CCD is better choice for deep sky photography and wide-field astrophotography features high precision double sided polishing Optical high precision double sided polishing to ensure that the parallelism is higher than 30 inch and high flatness 1/4λ, to ensure that does not affect the image quality other attributes Precision double-sided optical coating,non-two-piece glue,effectively improve the transmittance and cut off depth; electron gun evaporation technology;laser engraving LOGO never fade; Ion source assisted coating technology Ion source assisted coating technology (IAD),to improve the density of the film to ensure that the filter wavelength to minimize the impact of temperature caused by the temperature drift Note:7nm narrowband filter is not suitable for visual viewing. The human eye cannot capture such a narrow bandwidth band, and only a high-sensitivity camera can recognize it. Package Includes: 1xSVBNOY 2 inch H-Alpha 7nm 1xPP Material Plastic Box