Optolong SHO 7nm Filter Kit 36MM Unmounted (OPT-SHO-7NM-KIT-36MM)
OPT-SHO-7NM-KIT-36MM
Optolong SHO 7nm Filter Kit 36MM Unmounted (OPT-SHO-7NM-KIT-36MM)
OPT-SHO-7NM-KIT-36MM
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Product Description
Optolong SHO-7nm filter kit includes SII 7nm, H-Alpha 7nm, and OIII 6.5nm narrow band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can process Hubble images by astronomical post processing software.
Extra narrowband SIICCD7nm filter (Sulfur II for CCD) is designed for nebula observation allowing 7nm 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 vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)
H-Alpha 7nm filter is the popular narrowband filter allowing 7nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapour, and both high and low pressure vapour lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow). Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details.
Extra 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 line, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow).
OIII emits 495.9nm and 500.7nm and it is a blue-green coloured filter. Many of images of planetary nebula and supernova remnants are taken only with H-Alpha and OIIII filters. They show great structural details, but have natural colours, looking like an RGB image.
Coating Technology
Optolong uses a multi-layer, anti-reflection coating on each of the three filters. Each filter uses a non-cementing optical substrate coating, which is applied through precision Ion-based deposition, providing durability and resistance to scratching. It also provides stability on the central wavelength so there is no deviation depending on temperature change. Their planetary rotation system gives precision and homogenous coatings to ensure high-value pass-band transmission and off-band optical density.
What's in the Box
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