How it Works These mask will work equally as well on the end of a scope or on the end of a dew shield on top of that the mask itself does not need to be perfected centered on the scope this is due to the angle of the slits themselves. Who We areWe at Farpoint Astro are a California based manufacturer of astrophotography filters, scopes, and tools. Select a bright star as your guiding object. Best Sellers: Best Telescope Reflectors Tri-Bahtinov Mask for Celestron RASA8, Hyperstar, Fasts Bahtinov mask are a less expensive method of getting focus on objects in the night sky compared to a standard motor focuser. With the right mask and setup it's easy to get crystal clear focus on a star in less than 90 seconds. The same process applies using Live view display on your DSLR camera. Farpoint Bahtinov Masks Are one of the best tools for manually focusing your telescope available to astrophotographers. It will appear on your screen or computer as an X with a line through the center (when in focus). About this item Farpoint Bahtinov Mask for the Celestron 8 SCT with Hyperstar / Fastar ready system. Simple to fit, easy to use lifesaving focus tool, end your focus struggles. Bahtinov focus masks make focusing for astrophotography fast and easy. Ends the pain of struggling to find the best focus for your astrophotography images. Works with all electronic imaging devices. Includes DSLR... If you are using capture software be sure to compensate for the lag time between exposures on the screen, typically 4-5 seconds. Seestar S50 Tri-Bahtinov Mask For Celestron Edge 8" W/ Hyperstar, Split Connection Astrophotography Diffraction Mask
