SV226 filter drawer adopts integrated CNC molding and anti-light leaking design. It can also use 1.25" and 2" specifications on the market. Easier to install and pull out, but also provides effective installation protection, no need to worry about damage to the filter. Advanced CNC integrated molding processing, quality assurance. Thickness affects back focal length, which affects image quality and available accessory options. SV226 filter drawer can use with SV550 SV503 OTA or SV405CC SV605CC camera. The packaging is equipped with a plastic storage box to ensure that accessories around the filter drawer can be stored. The filter drawer comes with the M42-M48 adapter to resolve the thread compatibility issue. The interface can compatible with astronomical cameras of different specifications. SV231 filter is specially used to correct chromatic aberration and color unevenness. It improves the color quality and contrast of the picture by eliminating chromatic aberration and enhancing color saturation. Enhanced dielectric coatings result in hard, scratch-resistant and waterproof filters. High transmittance means high level of transparency, allows a significant amount of light or energy to transmit through it. Excellent optical performance and color expression add color to your deep sky photography.