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 SVBONY polarizer lens filters lens polarizing filter acts like a dimmer switch for the telescope;reduces brightness of the Moon or planets;glare or reflections;improves the objects contrast for great clear viewing. Adjust the amount of light transmission from 1% to 40% by rotating the filter housing. Reduces brightness of the Moon or planets for great clear viewing. Finer control of the image brightness compared to a standard fixed-transmission telescope filter for optimal performance. Fit any standard sized 1.25" telescope eyepieces and accessories.