Product Description
Sky Watcher 2 Inch Ultra High Contrast (UHC) Filter for Telescope - 20197
The Sky-Watcher 2 Inch Ultra High Contrast (UHC) Filter is the best all-around dark-sky nebula filter. This filter permits superb views of objects like the Orion, Lagoon, Swan and other extended nebulae. It performs well in smaller aperture instruments owing to its greater light transmission than the O-III, yet still suppresses light pollution well. Supplied with storage case.
The narrowband UHC filter, like the O-III filter, isolates the two doubly ionised oxygen lines (496nm and 501nm) in addition to the hydrogen-beta line (486nm) emitted by planetary and most emission nebulae.
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