SV226 filter drawer adopts integrated CNC molding and anti-light leaking design. It can compatible with 1.25" & 2" specifications filters on the market. Strong magnetic attraction, prevent the filter from falling off.Advanced CNC integrated molding processing, strong and sturdy.Thickness affects back focal length, which affects image quality and available accessory options.The filter is suitable for those astronomers who are already imaging using color cameras and don't want to transition to a monochrome camera set. Be the efficient astronomer with SV220 Dual Band Filters!SV220 telescope filter is also a fantastic solution to dealing with light pollution that is becoming more and more prevalent.The filter has relatively wide bandpasses, especially at the OIII wavelength (500.7nm width).