Suitable for both visual observation and imaging, this Opticstar 1.25" UHC Nebula Deep Sky Filter is all-in-one high-transmission deep sky filter. 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 filter is mounted in a machined aluminum cell which is threaded to accept additional filters.
|Captured wavelengths||OIII / H-beta