William Optics M92 4" Focal Extender
William Optics M92 4" Focal Extender
This 4" focal extender from William Optics utilizes a male and female M92 thread on both sides to provide more drawtube length without causing flex when connecting a CCD camera to the William Optics FLT 110 and 132 APO refractors. While referred to as a 4" extender by William Optics, this extender offers 66 mm of extension and measures 74 mm in total length.
This extension also can be used to conjunction with the William Optics 1x Flattener for GT71 and 81 to connect the 1x flattener (not included) to the Gran Turismo 81 APO refractor with WIFD.