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With the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Colour process
1x Raised finder stalk to clear the tube rings and dewshield
Double-sided fine optical polishing ensures λ/4 wavefront accuracy and <30 arc-second parallelism
This allows emission nebulae to be photographed with impressive contrast from suburban and even urban locations
letting you process your images like those taken by the Hubble Space Telescope
Optolong CLS-CCD Filters Size:EOS APS-C With the Ha and OIIIThe CLS CCD broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i. e. skyglow). Together with the highly transparent in main nebula
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