All-Star Telescope Canada - For All Things Astro!
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Products are usually delivered in 3-7 days.
Products usually ready for pickup from Edmonton Warehouse between 2 and 3.
Optolong improved narrowband SII6.5nm filter (Sulfur II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
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