How does a Dobsonian mount work?

A Newtonian telescope sits on a wooden box which allows it to move freely in azimuth (horizontally) and in altitude (vertically). The construction of the box is really quite simple: it consists of only a few parts that are assembled rather like an Ikea flat pack. To ensure ease of movement, the telescope and box are connected via sliding and rotating bearings. This allows the telescope to be moved in any direction with very little effort.

20 years ago and even earlier, large telescopes could be acquired for unbeatably low prices. A Dobsonian is also more easily transportable than virtually any other instrument.
Simply lift the telescope tube (OTA) off the rocker box and you have two separate parts in front of you for transportation. The telescope is also re-assembled again just as easily.
Whether in the field or on your own doorstep, set up is quick and easy - that is the simplicity of a Dobsonian mount.

Dobson Skywatcher 200/1200mm

Dobson Skywatcher 200/1200mm Skyliner Flextube AT

Dobson Skywatcher 250/1200mm

Of course there are not only advantages but also disadvantages with this type of telescope mount design, as with as any other design. Astrophotography is not possible with a Dobsonian telescope. Also at very high magnifications, for example when planetary observing, it is quite difficult to keep the object in the field of view. However, there are ‘Dobsonnauts’ who have found the optimal technique for high-magnification planetary observing.

These telescopes polarise the preferences of the amateur astronomy community.
Some swear by Dobsonian telescopes while others would never have anything other than a super-heavy German Equatorial Mount in the house.

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