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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 Great tool for astrophotography telescope: Reduces exposure times and simplifies astrophotography;works great to photograph 0.5x focal reducer Reduce 0.5x of the focal length for telescope eyepiece lens Double the photographic image video field Record a significantly larger portion of the lunar surface with web camera Standard 1.25 interface Fits for any standard 1.25” telescope eyepiece len FMC optical glass design 2 element optical design increases the light transmittance;the imaging is brighter and clearer Capture wider field of view The focal reducer is great for visual use for a bigger FOV and is indispensable when CCD imaging Fully threaded to minimize reflections Blackened edges and blackened interior to reduce scattering of stray light and maximize contrast Fully metal for long time using Besides the male thread;it also has female thread at the rear end to fit filters etc Specifications: Focal reducer: 0.5x Barrel size: 1.25 31.7mm Thread interface: M28.5x0.6 thread at both ends Sleeve material: full metal aluminum alloy Lens coated: broadband coated Lens ,aterial: pure optical lens Total height: 20mm Package includes: 1 x SVBONY 0.5x focal reducer