{"product_id":"askar-colourmagic-duo-band-c-filter-sii-oiii-2","title":"Askar ColourMagic 2\" Duo-Band C1 Filter - Ha + OIII - CM-DUO-C1","description":"\u003cp\u003eDesigned for deep-sky imaging of emission nebulae with a color camera, the Askar ColourMagic C1 Duo-Band Filter permits both H-alpha and Oxygen III wavelengths through while blocking those that contribute to light pollution.  The peak transmission is 90% at the center wavelength of 500.7nm and 656.6nm.  This combination will enhance contrast, darken the background sky, and produce better images of emission nebulae.  \u003c\/p\u003e\n\u003cp\u003eWhile this filter is similar to the D1 duo-narrowband filter, it is improved as far as peak transmission (90% vs 85%) and filter thickness (2mm vs 1.85mm).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eColourMagic C1 Duo-Band Filter Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFWHM:  OIII = 35nm+\/-5nm, Ha = 15nm+\/-3nm\u003c\/p\u003e\n\u003cp\u003eCWL:  500.7nm \u0026amp; 656.6nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmittance:  90%\u003c\/p\u003e\n\u003cp\u003eFilter Thickness:  2 +\/- 0.05mm\u003c\/p\u003e\n\u003cp\u003eBarrier Property:  OD3 @ 200-1000nm\u003c\/p\u003e\n\u003cp\u003eSurface Finish:  60\/40\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":40497187061873,"sku":"ASK-CM-DUO-C1","price":106.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/C1-Filter.png?v=1776458910","url":"https:\/\/khanscope.com\/fr-fr\/products\/askar-colourmagic-duo-band-c-filter-sii-oiii-2","provider":"Khan Scope Centre","version":"1.0","type":"link"}