Getting the best out of your Dobsonian mounted Newtonian Telescope

I’ve owned several Newtonians since my first Tasco 114mm scope in the early 1970’s.  Most recently I’ve had an 8″ Skywatcher, I traded up to a 12″ Skywatcher in 2020 and in 2025 I have my homebuilt 14″.

Telescope with purple cloth cover
14" homebuilt dobsonian

12" Dobsonian for sale, £500 including improvements

Now that my 14″ homebuilt dobsonian is settled in I’m ready to sell my 12″ flextube Skywatcher.

To be precise it is a Sky-Watcher Skyliner 300P FlexTube Dobsonian mounted Newtonian telescope.

It’s in excellent condition and comes with two very useful modifications.

A new one of these costs between £1000 and £1150 and that’s without the two improvements.

In order to find it a good home I’m asking £500.  It comes with basic 10mm and 25mm eyepieces which will get you started, and it will work well with significantly more expensive EPs.  I commonly used Baader 17mm and 8-24mm Zoom EPs.

The two modifications are a Lazy Susan azimuth bearing and an azimuth scale (see below). 

The azimuth scale is a professional print on an aluminium/rubber composite CNC’d disc.  And, the scale can be rotated for easy alignment.

To aid in setting the altitude, get hold of a digital inclinometer and attach it to the scope.  There are red LEDs illuminating the azimuth scale, and on a flying lead to shine on the inclinometer scale.

If you are interested in buying this scope then please email me at l*ese*f*sh@gmail.com (see website address above to fill in the *s.  I’ve done this to avoid spambots).

I can arrange a viewing of the scope in or around Beverley, and at a meeting of the East Riding Astronomers .

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Lazy susan bearing and adjustable azimuth setting circle
Modified Skywatcher 12" Dobsonian base
Easier to store and transport when "collapsed"
Excellent retention of collimation when expanded and collapsed
Supplied with 50mm straight through finder. Room for a telrad to be added.
Skywatcher Crawford single speed focuser
Optics are in excellent condition
place inclinometer here
Knobs allow easier adjustment