17.0mm Backfocus Spacer - part of QUADTCC-TEC160 (A5022)

May 31, 2021 - Part # changed to EXT327-17.0 to more clearly describe its function. 

This 17.0mm adapter is supplied with the QUADTCC-TEC160. You may purchase it separately to adapt the QUADTCC that you may have purchased for another telescope. The image for this product is the 22.1mm version (A5020).

Important Note: When purchasing the QuadTCC the proper length Backfocus Spacer is included for the scope specified. However, when ordering the QUADTCC for a TEC scope you will also need to order a Drawtube Endcap (S35RFAA) for the focuser. This only applies to the TEC focusers. This part is integral to the Astro-Physics 3.5" focusers and is not needed as a separate purchase. The S35RFAA screws onto the drawtube's 4.100" x 24 thread (same as Starlight Instrument's 3.5" focuser endcap thread).