20+inch+F3.8+Dobsonian

The following describes the making of a 20 inch F3.8 Dobsonian. This telescope is based upon the 20 inch F4 Dobsonian we completed back in 2010, but with some modifications. Dave Robinson is the current owner.

Telescope design and construction
20 inch F3.8 Construction 20 inch F3.8 Mirror support

Telescope Assembly and Collimation
20 inch F3.8 Dobsonian Operation and Maintenance

Making the 20 inch F3.8 mirror
20 inch F3.8 Figuring

Completed Telescope
20 inch F3.8 Gallery

Image below shows the telescope finally completed June 2013. The mirror has been re-figured and is now good and higher powers can now be used.