This link includes SV220 Dual-Band H-a 7nm & OIII 7nm 1.25inch/2inch Nebula Filter, you can choose to buy filters that suit the size of your telescope. SV220 Dual-Band 7nm Nebula Filter Review Author:AstroCreation https://www.youtube.com/watch?v=2ZG1zq9BLp0&t=172s SV220 Dual-Band H-a 7nm & OIII 7nm Filter The SVBONY 7nm dual band filter is designed to drastically reduce the effect of light pollution, for emission nebulae, planetary nebulae and supernova remnants imaging. SVBONY SV220 Dual-band 7nm Filter The 7nm bandwidth strongly isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue) from anything else, ensuring that the shooting astronomical object is pure enough, free from non-target spectral interference. Greatly Reduce the Effect of Light Pollution & Moonlight The SV220 filter greatly reduces the effect of light pollution and moonlight, and makes it possible to do photography in a light polluted environmental conditions, like on your balcony or in your backyard. Meanwhile it saves your time on the road and cost on the fuel. More Simplified for Photography and Post-processing Comparing to the traditional DSO photography plan “Monochrome camera + SHO filters + Filter wheel” and long single channel exposure time and post-processing, SV220 dual-band filter simplifies the tediousness and difficulties of photography and post-processing, gaining full color images with one-shot. M48*0.75 Male Thread M48*0.75 For f/5 & Slower Telescope SV220 Dual-band Filter Installation Package Includes: SVBONY 2" 7nm Duo-Band OSC Filter PP Material Plastic Box or SVBONY 1.25" 7nm Duo-Band OSC Filter PP Material Plastic Box

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