Optolong OIII Filter 6,5nm 2" (50.8mm)
US$ 200.49Extra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
Optolong SII Filter 6.5nm 2" (50.8mm)
US$ 200.49Extra narrowband SII-CCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
Optolong H-Alpha 7nm 2" (50.8mm) v.2
US$ 204.06The H-ALPHA 7nm filter is the most popular narrow-band filter that allows a 7nm bandwidth centered on a 656nm wavelength.
Optolong L-eXtreme Filter 1.25" (31.8mm)
US$ 204.06The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.
Optolong L-QEF L-Quad Enhance Filter 2"
US$ 212.97L-QEF eliminates light pollution caused by mercury and sodium lamps and produces a broadband image with minimal color cast. This filter is broadband and suppresses wavelengths of light pollution. It is great for star clusters, dark and reflection nebulae, as well as galaxies in skies affected by light pollution.
The L-Pro CCD filter improves the contrast of deep-sky objects and reduces the sky background.
Antlia RGB Triband 2" Filter
US$ 230.79Anti-pollution filter effectively isolates the emission lines not only of emission nebulae but also of galaxies, clusters or globular clusters and reaches a maximum transmission of up to 97%.
Optolong L-eXtreme Filter 2" (50.8mm)
US$ 266.43The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.
