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The Astronomik CLS Filter (not IR blocked) is the best deep sky and general purpose filter and one of my favourites.
This broadband light pollution filter works on all objects for both visual use, and imaging with standard and Baader modded DSLR cameras.
Blocks Sodium, Mercury and air-glow emission.
Can also be used as an effective minus violet filter by refractor owners.
Not UV / IR blocked.
Astronomik UHC Filter – This filter was designed for the visual observation of emission and planetary nebulae but also works very well for imaging these objects, as a dual type filter, if used with an IR block. The IR block can be either inbuilt, as with a DSLR, or in combination. The Astronomik L3 type luminance filter gives particularly good results. Price includes delivery.
Astronomik UHC-E Filter – This filter was designed for the visual observation of emission and planetary nebulae with (mainly) smaller scopes, but also works well for imaging these objects if used with an IR block. The IR block can be inbuilt, as with a DSLR, or in combination. The Astronomik L3 type luminance filter gives particularly good results and colour balance. Price includes delivery.
The Astronomik OIII Visual Filter is mainly for observing planetary nebulae, it’s unsuitable for use with CCD cameras except in combination with an additional IR block filter.
The Astronomik H-Beta Visual Filter is useful for visual detection of the Horse Head, California and some other nebulae with larger telescopes.
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