Askar 2.5 inch F3.9 Full Frame Reducer for FRA400/FRA500

Maximize Deep-Sky Imaging with the Askar 2" F3.9 Full Frame Reducer for FRA400/500 Enhanced Astrophotography Performance: The F3.9 full frame reducer transforms the FRA400 astrograph by reducing its focal length to 280mm and adjusting the focal ratio to a rapid f/3.9. Optimized Exposure Times: Significantly shortens exposure times, perfect for capturing detailed images of deep-sky objects without the long wait. Reduction Factor: Offers a 0.7× reduction, optimizing the original 400mm focal length and f/5.6 focal ratio to meet advanced astrophotography demands. Precision Engineering: Designed with a standard 55mm back focus to maintain optimal distance between the reducer and sensor for clear, sharp images. Built-in Filter Thread: Comes with an integrated M48×0.75 thread, allowing for easy attachment of 2" filters to enhance image quality and versatility in various lighting conditions. Ideal for Deep-Sky Astrophotography: Perfect for astronomers aiming to capture expansive celes