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STC ULTRA LAYER® ASTRO-MULTISPECTRA FILTER
COMPATIBLE WITH CANON EOS APS-C
The material is A2 stainless steel which is virtually non-magnetic and less brittle at low temperatures. Specially designed Clip-shaped structure could be pressed firmly while attaching the lens on camera body. Therefore, the paralleled focal plane could ensure focusing performance clearly.
It is coated by the use of the IBAD (Ion beam-assisted deposition) technology on Schott® B270 optical glass, working for higher durability and easily cleaning. It will significantly reduce the interference from artificial lighting, such as mercury and sodium street light, yet allow the important nebula emission lines to pass, thus enhancing the contrast of astronomical objects
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