20 inch Dobsonian Design, Build and Observing

A big 'scope tour! Lots of ideas, tips and advice on building and using a big telescope. Amazing views through an amazing bit of kit. A tour through Alan Marriott's homemade 20-inch / 505mm telescope at Kelling Heath Star Party, England. My thanks to Alan Marriott for showing us his wonderful telescope and also for letting us view through it. We had a wonderful view of the Orion Nebula in the early hours of the morning. 00:00 Star Party Observing 00:41 Telescope Design and build 02:44 Scope Dog: Tracking and GoTo 04:41 Filter Wheel 06:03 Improved Secondary Collimation 08:04 Wheel Barrow Handles for Portability 09:18 Scope weights and balance 09:44 Power System 10:55 Painting and Finishing 12:59 Fitting Truss Connectors 14:09 Fitting Scope Dog: GoTo & Tracking 20:11 Observing with a 20-inch 23:10 Favourite Deep Sky Objects 26:34 Improved Front Collimation 26:48 Lightweight Mirror Cell 28:25 Dew Heater for Primary Mirror 29:15 Rain / dew drain holes 29:45 Scope Cover & Tying Down