Optolong 31mm Unmounted Filter Set with LRGB and 7nm H-Alpha Filters
Experience fantastic planetary and deep-sky observations with Optolong's 31mm Unmounted LRGB/H-Alpha filter set. In this set, you will get Optolong's Luminance, Red, Green, and Blue (LRGB) filters and a 7nm Hydrogen-Alpha filter. All filters have a 31mm aperture and come unmounted.
Each filter in the Optolong 31mm Unmounted Filter Set is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength or CWL. This filter set is designed to be used in color filter wheels that accept 31mm unmounted filters. It doesn't matter which way you drop them into the filter wheel. The filters are unmarked and either side can face up or down.
Optolong LRGB Filter Set - The Optolong LRGB Filter Set comes with four 31mm unmounted filters, including Red, Green, Blue, and Luminance. They are designed for de-bayered monochrome CCD and CMOS cameras and work great for both planetary and deep-sky imaging. Like all Optolong filters that are designated as “CCD”, this filter set blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.
Optolong 7nm H-Alpha Filter - The Optolong H-Alpha 7nm is an extremely narrow emission-line filter that works by allowing a 7nm bandwidth of light, centered on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths. Wavelengths that are responsible for natural light pollution, or skyglow, are drastically reduced, as is artificial light pollution caused by high and low-pressure sodium vapor and mercury vapor lights. The result is a high contrast image that reveals the H-alpha line in all its glory.
Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design, and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.
Optolong 31mm Unmounted Luminance Filter
Optolong 31mm Unmounted Red Filter
Optolong 31mm Unmounted Green Filter
Optolong 31mm Unmounted Blue Filter
Optolong 31mm Unmounted 7nm H-Alpha Filter
Dimensions & Specifications
Filter - Single or Set: Filter Set
Filter Size: 31 mm
Filter Type: Broadband Deep-Sky
Filter Shape: Round
Mounted or Unmounted: Unmounted
Filter Set Contents: 31mm Unmounted Luminance / Red / Green / Blue / 7nm H-Alpha Filters
Filter Warranty: Two Years
We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.
Return & Exchange Policy
At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.
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