Suitable for both visual observation and imaging these are all-in-one high-transmission
deep sky filters.
Scattered light from the other wavelength ranges is excluded, this makes the background
darker bringing out more detail in gas and planetary nebulas. The filter captures wavelengths
in both the OIII / H-beta and H-alpha bands.
The filters are mounted in a machined aluminium cell which is threaded to accept additional
filters.
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