Astro Tutorial #1.15: Barlow Lens and Focal Reducer
10:25
Astro Tutorial #1.16: Deep Sky vs Planetary Imaging
12:11
Astro Tutorial #1.9: Telescopes, Eyepieces & Magnification
13:40
Reductores de focal en los telescopios- ESPACIO CELESTE
11:08
What is the difference between Barlows, Focal Extenders and Focal Reducers?
19:58
Barlow Lens - Complete Overview and Function
29:13
Watch this before you buy Celestron 8SE SCT, or a Focal Reducer or a Hyperstar
9:03
Astro Tutorial #1.11: Telescope Mounts - ALT/AZ vs EQ
12:11