The OA-AF102-FS is a focus assist set designed for the entry level Celestron AstroFi 102 Maksutov Cassegrain Telescope.
It comprises of a nested Dust Cap and Bhatinov Mask which replaces the Celestron dust cap. The Bhatinov Mask and Dust Cap fit together as a single unit, ensuring that you'll always have your Bhatinov Mask to hand when you come to focus your AstroFi 102. Simply remove the dust cap from the bhatinov mask to start focussing, replace it when done and then remove the whole assembly to start observing or shooting. This cuts down on storage and clutter and ensures you'll always know where your bhatinov mask is.
Also included is a fine focussing knob which replaces the rubber cover on the existing focussing knob. Simply pull of the rubber cover and then gently but firmly push the fine focussing knob onto the exposed metal focussing knob. The greater diameter of the fine foccusing knob allows for more refined focussing adjustments, helping you to achieve the best possible focus on your AstroFi 102.
