William Optics 0.8X Reducer & Field Flattener for FLT91 - FLAT6AIII-M92 31mm Eyepieces System includes the B3400 blocking

System includes the B3400 blocking filter which provides full disk images on telescopes up to 3060mm focal length

Ability to save Dark Fields

the user is free to remove the hand control from its holder for remote use or leave it cradled for hands-free operation

They also excel at lunar and planetary viewing - as well as terrestrial objects

William Optics 0.8X Reducer & Field Flattener for FLT91 - FLAT6AIII-M92 31mm Eyepieces System includes the B3400 blockingThe William Optics FLAT6AIII for the Fluorostar 91 refractor brings imaging to the next level of adjustability and image quality. This 0. 8X field flattener uses Ohara optical glass in an FMC Triplet APO design for amazing clarity and sharpness. The William Optics FLAT 6AIII adjustable Focal Reducer & Field Flattener has an image circle large enough to cover full frame, 43. 26 mm diagonal sensors! The FLT91 version of the FLAT6AIII has M92 threads on