Back-Focus 101: Celestron EdgeHD: C9.25, C11, and C14 Advanced Back-Focus with the Celestron OAG
11:53
Back-Focus 101: The Petzval Lens ft. William Optics RedCat51
12:23
Back-Focus 101: Celestron EdgeHD: C9.25, C11, and C14 Basic Back-Focus for DSLR and CCD/CMOS Cameras
23:53
Setting Up An Off-Axis Guider
18:11
Backfocus on the EdgeHD 8 using an OAG
18:45
Telescope Back Focus: The Ultimate Guide [TAIC Short]
16:14
Big & Long VS Small & Short - Are big telescopes worth it?
14:34
Back-Focus 101: Celestron 8" EdgeHD SCT (no reducer)
20:00