ZWO 0.76x Reducer for 80mm Quad APOZWO has also released a new 3 inch FF80APO 0. 76X full frame reducer with a three element optical design, including one element made of ED glass. Its reduction factor is 0. 76x, which gives the FF80APO f 7. 5 astrograph a shortened focal ratio of f 5. 7 and a shorter focal length of 454mm. This allows for less total integration time and a wider field of view, bringing more convenience and possibilities for your wide field deep sky imaging. The reducer