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Dobsonian OD250 L Specification:

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

 Model dimensions

Total telescope weight 24Kg
Tube weight only 13Kg
Tube diameter 280mm
Tube length 1550mm
Focal Length 1600mm
Focal ratio f6.3
(Weights approx.)

250mm f6.3 Dobsonian
complete with Mount & Tube Rings

The OD250L produces excellent images, particularly of higher power subjects. The tube is a little longer than the OD250S version but for a dedicated planetary observer it is a small price to pay for such high quality images.

The tube requires the lowering of the passenger seat of a family car and as shown earlier, the ultra rigid mounting 'collapses' into 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 competitor'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 current, or past owners of Dobsonians are all to familiar with. 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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