This shows everything that is attached to the back of the TEC APO180FL for imaging. From left to right; You have a *custom adapter/spacer made to replace the stock 3.5” Feather-Touch focuser. FLI-Atlas focuser, a *custom three point adapter made to allow the use of the Astro-Physics 4” 160FF or 160TCC, a *custom off access guider (OAG) this allows the FF and TCC to thread directly into the OAG, an SBIG Sti-guider, FLI 2-7 filter wheel, FLI-ML16200 / MLx694 camera. * All custom adapters are home made by myself. . .