This version does not block out infrared wavelengths (700-1100nm) so a separate IR cut-off filter is recommended for imaging applications.Founded in 1999, Optolong has become an integrated enterprise not only specialized in R&D, but also good at manufacturing. Spectral Curve Transmission Characteristics is the brand owner of optolong who is the joint of industry and trade. Enhance contrast of moon, galaxies, nebulae and globular star clusters.Ĭ. ![]() This is a versatile filter for visual observation and astrophotography of planetary nebulae.Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters. Asking 340 for all three, including PayPal and shipping to lower 48. Ha- 7nm Sii- 6.5nm Oiii- 6.5nm Prefer to sell the set, but depending on response, may be willing to separate. is the brand owner of optolong who is the joint of industry and trade. ![]() Optolong's Moon & Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow (589nm) and many street light emissions from artificial light. Filters are in excellent/like new condition and lived in my filter wheel from time of purchase until now. Color Correction & Minus Violet FiltersĪ.It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. ![]() The 3nm isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue). Filter mount thickness: above threads: 5mm including threads: 6.78mm.
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