In this episode of BackFocus 101, I cover advanced backfocus for the Celestron C9.25, C11 and C14 EdgeHD Telescopes. I demonstrate how to attach the Celestron OffAxis Guider (COAG), ZWO Electronic Filter Wheel (EFW) and the ZWO 2600MM Pro, all while still maintaining the proper 146.05mm of backfocus (or 147.05mm of backfocus when using filters). I also give my tips and tricks for setting up the COAG and which guidecamera I use with the system. The key to offaxis guiding is to remember that the main imaging train, and the guide imaging train need to have the same backfocus.

If you'd like to see how filters affect your backfocus distance, please check out the following episode of BackFocus 101:    • BackFocus 101: How Filters Affect Ba...  

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