Meade Instruments 07545 LX f/6.3 Focal Reducer and Field Flattener (Black) Reduces your telescopes focal ratio by 0.63 Reduces exposure times and simplifies astrophotography Improves edge-of-field resolution by flattening the telescopes field Features a 4-element, multi-coated 41-millimeter lens within a metal cell Comes with a 1-year limited warranty