Guide to Refractor Optics - Choosing the Best Telescope for You!
17:47
King of image quality - A deep dive into the refractor telescope design
33:26
5" Refractor Shootout
34:57
4 Telescopes Tested: Doublet vs. Triplet vs. Quadruplet vs Quintuplet
14:28
Eyepiece Upgrade Guide - What you need to know!
11:08
A falha fatal do telescópio refrator Bresser 60/900 AZ
13:59
What Makes a Great Planetary Telescope? 6 Scopes Put to the Test!
51:26
What's Up? Webcast: Picking a Refractor for Visual
12:46