The SVBONY ultra high contrast filter/UHC telescope filter is designed to improve the image contrast of nebulae and other deep-sky objects. UHC filters or light pollution reduction filters are designed to selectively reduce the transmission of certain wavelengths of light;especially those produced by artificial light. Due to its ability to produce exceptionally sharp and clear images;this filter is considered one of the most popular astronomy accessories; it can be used not only for celestial observations but also for astrophotography. Main points: Brand New SVBONY 1.25" UHC filter. Sky background is darker for observations of deep-sky objects.SV226 filter drawer adopts integrated CNC molding and anti-light leaking design. It can also use 1.25" & 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. Package Includes: Drawer Frame x 1PCS 2" Filter Slider x2PCS 2"-1.25" Filter Adapter x1PCS M42F-M48M Adapter x 1PCS Plastic Case x 1PCS