The Optolong SHO-3nm Telescope Filter Kit includes unmounted SII 3nm, H-Alpha 3nm, and OIII 3nm narrowband filters. All three of the filters reduce certain types of light transmission such as artificial light from mercury vapor and both high/low pressure sodium vapor lights. The filters also block natural light transmissions caused by neutral oxygen emission in our atmosphere, often called sky glow.
The filters provides higher contrast, greater detail, decreased background noise, and increased faint nebula signal for astrophotography. The set works best with monochrome cooling CCD astronomy cameras and modified DSLR imaging in each channel. The HA, OIII, and SII correspond with the RGB channel, allowing imagers to process Hubble images with post-processing astrophotography software.
The Optolong SHO-3nm Telescope Filter Kit offers a multi-layer, anti-reflection coating on the filters. Each filter uses a non-cementing optical substrate coating, which is applied through precision Ion-based deposition, providing durability and resistance to scratching. The coating also provides stability on the central wavelength so there is no deviation depending on temperature change. Optolong’s planetary rotation system gives precision and homogenous coatings to ensure high-value pass-band transmission and off-band optical density.
The Optolong H-alpha filter is narrowband and allows 3nm bandwidth of light, centered on a 656nm wavelength. This filter is designed for those looking to have better contrast and the ability to capture subtle nebula details.
The Optolong OIII is an extra narrowband filter that corresponds with the OIII emission line, allowing 3nm bandwidth of light, centered on a 500nm wavelength. OIII filters emit 495.9nm and 500.7nm and are blue-green colored filters. When coupled with the H-alpha filter, users will get in-depth images with great structural details and natural colors, as with an RGB image. With coating optimization, Optolong has ensured the OIII filter performs well with bright stars after performing a qualitative halo test.
The Optolong SII (Sulfur II) CCD filter is an extra narrowband filter and is designed for nebula observation. The SII filter allows 3nm bandwidth of light centered on a wavelength of 672 nm.
You can learn more about the Optolong SHO-3nm Telescope Filter Kit here.
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