Lower magnification and wider field of view;shorter exposure times for astrophotography when you are using the SVBONY 1.25" 0.5x focal reducer. It can reduce the telescope focal length to the 0.5 times of the original's;it's also great for visual use for a bigger FOV and is indispensable when CCD imaging. 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.