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Orion optics UK ODK20 20 inch F6,8 Astrograph OTA

Prijs: 30.800,00 EUR

Product Details

The full range is based on a focal ratio of f6.8, fast enough for some superb deep sky photo-visual use and, still have enough focal length for high resolution planetary work both visual and CCD applications.

The tube is constructed from Carbon Fibre sandwich design. Very, very strong to avoid flexing and, zero expansion to ensure the focal plane does not change over long photographic exposures. Being an open tube design and very short, cool down times are remarkably fast.

To assist cool down of the telescope, each model is fitted with three fans, all positioned behind the primary mirror.

Exact focusing across the ODK range is achieved with our own Precision ACU-3S 3” Crayford Focuser featuring a 10:1 reduction drive included as standard - focuser pictured right. Good images need good optics, all fitted in reliable, stable and precise engineering.

Customers with heavier than normal (4kg+) CCD equipment can add features to the ODK tube to enhance stability.

To produce the photo-visual wide, flat field of the ODK range, we have designed and fitted integrally, a corrector lens system. which ensure both colour correction, coma and spherical aberration are optimised to achieve almost a perfect photographic and visual field. Adequate back focus allows all modern CCD cameras to be used with auxiliary equipment. Multi layer anti reflection coatings are applied to all lens surfaces to maintain brighter images.

CNC machined mono construction secondary spider and trim ensures stability in collimation. Our unique collimation adjustment system enables perfect collimation of the secondary mirror to be achieved, quickly and reliably.

Because of many, many possible clients asking us for a larger model in the ODK range we are now in the process of offering a 500mm model with a carbon truss type tube.

We made two similar models to the one we have now in production and these were supplied to the ESO and ENO observatories.

Brief specification of the ODK20 is shown it the table, it is indeed a marvellous instrument and is based around a design which has supplied data to assist in the control of these two enormous main instruments iat the Canary Islands and Paranal observatories.

As a minimum we recommend a Paramount ME to compliment the scope or mount with similar carrying capacity.

We expect to customise several aspects of every model to your own specifications. We do not wish to impose a fixed design if a few modifications could suit your needs better. Prices quoted are for standard specification.





Focal length


Focal Ratio


Tube Weight (inc.
mount plate/dovetail)


Central Obstruction

39% of the Primary
Mirror Diameter

Back Focus from
Cell outer surface


OTA Length


Tube Material

Carbon fibre and
Carbon fibre struts

Primary Mirror Dia.


Primary Mounting

Collimated and Fixed

Primary Material

Schott Suprax

Primary Coating/Shape

Hilux 97%

Secondary Mirror Dia.


Secondary Material

Schott Suprax

Secondary Coating/Shape

Hilux 97%

Lens Group Dia.


No. of Lenses


Lens Group Coating

AR Coatings

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