Dobsonian Telescope - Commercial Adaptations

Commercial Adaptations

The intent of the Dobsonian design when it was first originated in the 1960s was to provide affordable extremely simple and rugged large-aperture instrument at low cost. These same attributes facilitate their mass production. One of the first companies to offer the Dobsonian commercially was the now defunct company Coulter Optical (now part of Murnaghan Instruments). They helped popularize the design with models in the 8 inch through 17.5 inch size range in the 1980s and 1990s that were built using Dobson's original concept. Meade Instruments and other manufacturers began to introduce their variation on this design by the late 1990s. Although manufactured scopes include such niceties as metal tubes and more refined hardware, these telescopes are still extremely affordable. In late 2006, 6 inch models cost around $300 US and 10 to 12 inches (250 to 300 mm) scopes can still be had for under $1,000 US.

Since the late 1990s, Dobsonians using the truss tube design became increasingly popular with manufacturers. In 1989, the first commercial truss tube Dobsonian was released by Obsession Telescopes into the market. Manufacturers of these truss tube Dobsonians have differentiated themselves by going in the opposite direction from John Dobson's original intent by catering toward the upper end of the market and more experienced observers. These telescopes came with full thickness mirrors and use higher end materials such as Baltic birch or similar plywood and cast aluminum fittings. These designs also employed the "rocker box" mount listed above.

As of the early 2000s these truss tube Dobsonians are the largest commercially available telescopes, with three manufacturers offering models in the 24 inches (610 mm) to 30 inches (760 mm) range (hard tube and other reflector designs typically stop at 18 inches (460 mm) due to the size of the tube). As of March 2010, Orion Telescopes & Binoculars offers the largest commercially available trus tube Dobsonian, a 50" aperture model. As these scopes require teams of several people to operate and require the observer to perch on top of a ladder, the markets for these scopes is limited. Telescopes with a 15 to 18 inches (380 to 460 mm) aperture appear to be the most popular size, as they maximize the amount of aperture yet can still be easily be set up by one person. In early 2009 prices can range from $800 for a 12" instrument to $3500 plus for 18" or larger instruments, depending on the quality and features.