0.8x Reducer Flattener for Fluorostar 91

Description For FLT 91 ONLY! Special edition flattener/reducer with adapter for the Fluorostar 91 telescope. Note:  Adjustment Distance for DSLR and Mirrorless Cameras (and other cameras with the same backspacing) is 5.4mm This William Optics 2" Field Flattener and Reducer has been designed to optimize the flat-field imaging performance of William Optics GT71, GT81, Z81 & Z103 refactors. The APO triplet optics of the Field Flattener and Reducer are made with Ohara glass and fully multi-coated to provide good illumination and a beautifully flat field across 97% of full frame sensors. The reducing factor is 0.8X. Designed with M63 threads on the telescope side, the Field Flattener and Reducer will thread directly into the telescope. Just remove the three screws on the focuser adapter, take off the adapter, and thread the focal reducer/field flattener on in its stead. The Field Flattener and Reducer has 2" threads on the opposite side to accept a 48mm (Wide) T ring for your DSLR. Ther