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Dobsonian OD250 S Specification:

1/4PV Optics with Standard Coatings
2" Focuser
30mm Finder
25mm Plossl Eyepiece

 Model dimensions

Total telescope weight 23Kg
Tube weight only 12Kg
Tube diameter 280mm
Tube length 1140mm
Focal Length 1200mm
Focal ratio f4.8
(Weights approx.)

250mm f4.8 Dobsonian
complete with Mount & Tube Rings

The OD250S is the most compact of our 250mm models. The tube easily fits across the back seat of any family car and as shown earlier, the mounting 'collapses' in to an incredibly small amount of space.

The mounting is made from aluminium plate, similar to that used in aircraft production and is incredibly strong and coated with hard polymer for scratch resistance.

One of the special features on our OD Dobsonians is the ability for existing owners of our OTA's or even competitior's OTA's to be able to just drop their tube straight into one of our mounts. A further tremendous advantage is the ability to exactly balance the tube to avoid it moving with the weight of added equipment, large eyepieces, cameras, large finders etc. This is a feature only existing or past owners of Dobsonians are all to aware of. Typical Dobsonian designs are renowned for the tube swinging down when equipment, even of the slightest weight, is added. To avoid this, elaborate devices are often used which seldom work properly. More common is to increase the drag on the declination axis thus increasing the drag on those bearings and, as a consequence, creating a severe problem in not allowing smooth adjustment of the telescope's position. With the use of our fully adjustable tube cradles and PTFE bearing surfaces you have the capability of adjusting the balance point exactly to accompany the additional equipment you may have added. If you feel the focus mount is not exactly in the most comfortable position for viewing, just rotate the tube for a better, more friendly position. For users who wish to have total control, we offer an optional variable friction brake

Downloads

250mm Dobsonian Mount
£230

Mount includes:

Rocker box, all PTFE bearing surfaces, polymer non scratch screw on feet, declination CNC machined bearing rings. To fit an OTA, tube rings and blocks are required to suit your OTA size.

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