Lumicon 1.25" UHC Filter
The 1.25-Inch Round UHC Filter by Lumicon:
This original Lumicon 1.25-inch Ultra High Contrast Filter is incredible for revealing nebulosity. This is achieved by passing three nebula emission lines-the two doubly ionized oxygen lines (496 and 501 nm) and the H-beta line (486 nm)-while blocking light-pollution and skyglow. The result is superb views of the Orion, Lagoon, Swan, and other extended nebulae.
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