The Chroma SHO Filter Set contains unmounted SII 5nm, H-Alpha 5nm and OIII 5nm narrowband filters, which are generally used with monochrome CCD cameras and modified DSLRs for astrophotography. According to the RGB channel (HA, OIII, SII), photographers can work out the Hubble palette with the help of suitable software.
The extra narrowband SII CCD 5nm filter was developed for nebula observation and allows a bandwidth of 5nm centred on a wavelength of 672nm. It thus reduces the transmission of certain wavelengths, especially those produced by artificial light, including mercury vapour lamps. The unwanted natural light caused by the emission of neutral oxygen in our atmosphere (e.g. air glow) is also blocked.
The H-Alpha 5nm filter is the popular narrowband filter that transmits a bandwidth of 5nm with a wavelength of 656nm and reduces the transmission of other wavelengths. It ensures maximum contrast and reveals subtle nebula details.
The extra narrowband OIII CCD 5nm filter allows a 3nm bandwidth of light centred on a wavelength of 500nm, which corresponds to the OIII emission line, emitting 495.9nm and 500.7nm. It is a blue-green colour filter. Many images of planetary nebulae and supernova remnants are taken using only H-alpha and OIIII filters. They show great detail but have natural colours that look like an RGB image.
Features of the SHO filters:
- Provide higher contrast and significantly more detail in nebulae
- reduce background noise and improve the structures of objects
- Increase faint nebula signals and improve imaging
- With this set, you can produce images in the Hubble palette
- Optimised, durable coating
