Quick view 2.5" Dual-Speed Focuser F-SV25B 2.5” Dual Speed, Fully Rotating, Rack and Pinion Focuser Featuring about 95 mm of travel, this import focuser is a precise dual speed unit that is threaded for our field flatteners that have an M63 attachment thread. To get to this... MSRP: Was: Now: $265.00 Add to Cart Compare