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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.
The Astronomik CLS CCD Filter IR Blocked has all the benefits of the standard CLS CCD filter but with IR blocking built in.
This broadband light pollution filter works on all objects and can be used visually and for imaging with CCD and plain glass (full spectrum) modded DSLR cameras.
The IR Pro (742nm) Filter pushes the passband of the Baader and Altair IR pass filters further into the Infra Red. At these longer wavelengths, planetary images are much less disturbed by distortions in the atmosphere.
This is the best “Planet Killer” filter, based on research by Astronomik to determine the optimal passband for enhanced Planetary Imaging, with most amateur equipment.
Sensitivity of most CCD cameras is still fairly high in this region so smaller scopes (>5″) can benefit.
Astronomik UHC Filter – This filter was designed for the visual observation of emission and planetary nebulae but also works well for imaging these objects if used with an IR block filter.
Good results can be obtained with modified DSLR cameras.
Astronomik IR Pro (807nm) Filter – This filter extends the IR passband much deeper into the IR.
These very long wavelengths allow planetary imaging in poorer seeing conditions than normal.
The sensitivity of most CCD cameras is reduced in this region so scopes of over 8″ aperture draw the most benefit.
The Astronomik OWB Type 3 Clip-Filters (Original White Balance) restore the colour balance of an astro modified DSLR to make it suitable for use on terrestrial subjects.
The Astronomik OIII Visual Filter is mainly for observing planetary nebulae, unsuitable for use with CCD cameras without an IR block.
The Astronomik H-alpha 12nm CCD Clip-Filter EOS R XL is suitable for imaging of Hydrogen nebulae from sites with light pollution and from dark sites too
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