APM-Riccardi Reducers/Flatteners
Massimo Riccardi, famous optical designer from Italy, designed for APM-Telescopes an excellent 3 element 0.75 x Apo-Reducer/Flattener Corrector for all TMB-APM-LZOS Apochromatic Telescopes. Tests show that it also works on Apos from other manufacturers as well. The reducer shortens the focal length by a quarter and corrects the image circle - thereby converting your telescope into a fast astrograph!