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

Brand :

Part # changed to EXT327-17.0


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).


Backfocus Spacer Length Part Number
22.1 mm A5020
18.3 mm A2680
17.0 mm A5022
16.0 mm A5023

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).

Scope Part Code Backfocus Spacer Spacing with Bf. S. Spacing without Bf. S.
AP 130 GTX QUADTCC-AP130 22.1 mm 80.8 mm 102.9 mm
TEC 140 QUADTCC-TEC140 18.3 mm 80.8 mm 99.1 mm
TEC 160 QUADTCC-TEC160 17.0 mm 80.8 mm 97.8 mm
TEC 180 QUADTCC-TEC180 16.0 mm 80.8 mm 96.8 mm