This spare filter holder is designed for SVBONY SV226 filter drawers,It provides you with a more convenient combination. CNC integrated molding; more precise production process; strong and sturdy.With this filter drawer holder, you will be more convenient to use filters for deep sky photography; can accommodate 2-inch round, mounted filters, along with other 2-inch round filters that measure 50.8 mm wide and 7.5 mm thick. SVBONY SII filter works to filter out light pollution. More objects remain sharp in the image and details are more clearly visible. You can connect to your 2 inch eyepiece and make the sky you see even better. This SII filter blocks infrared wavelengths from 700nm to 1000nm so you don't need a separate IR-Cut filter. The thickness of the substrate can affect parameters such as wavelength and dispersion of the filter. The Full Width at Half Maximum (FWHM) is about 5 nm. The filter transmits a 5nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions. The filter enhances the contrast between object and sky, allowing you to take good quality images. M48x0.75 thread interface adapts to most devices.