Alpine Astronomical Baader 2" Female SCT to Female M41.5x1 Reducing Adapter

The Alpine Astronomical Baader 2" Female SCT to Female M41.5x1 Reducing Adapter was originally designed to allow the use of their Hyperion Universal Zoom Mark IV eyepiece in any spotting scope equipped with M41.5 male threads�such as Bausch & Lomb, Opticron, and Kowa. Since it is just a simple reducer ring that fits standard 2" Schmidt-Cassegrain Telescope (SCT) threads, it can be used for a variety of applications beyond its initial intended application as either a general-purpose reducer or expander based on your needs.

The outside male threads match the Hyperion locking ring as well as standard 2" SCT visual back threads, and the inside female threads are M41.5x1 size. With continuous threads, when it is installed on your Hyperion eyepiece, SCT backs, and other 2" threaded accessories, the adapter can be set flush, so while the thread size is converted there is no additional optical length added that will affect back focus distances. To assist in proper installation and removal, the ring has two 2mm face holes that allow the use of their Spanner Wrench, which is available separately.