Triplet Refractor Apo Reducer/ Flattener - Attachment & Backfocus
9:10
Back-Focus 101: How Filters Affect Back-Focus
26:58
ZWO: EAF (Focuser) – Unboxing, Attachment & Backlash Determination
15:18
TESTING Reducer, Flattener and THREADED adapters for the 106mm F6 Founder Optics FOT106!
8:10
Backfocus with an ZWO Cooled Camera
43:23
4" APO Refractor Shootout
12:55
TS-Optics CF APO Series
24:53
Unboxing and setup the TS 76EDPH Refractor
18:45