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ODK20range

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

Two similar models to the one we have now in production have been supplied to the ESO and ENO observatories.

Brief specification of the ODK20 is shown it the table top right, 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.

*The weights shown on each model refer to the standard optical tube with no additional equipment added.

Specification

ODK20

Aperture

500mm

Focal length

3400mm

Focal Ratio

f6.8

Tube Weight (inc.
mount plate/dovetail)

61kg

Central Obstruction

39% of the Primary
Mirror Diameter

Back Focus from
Cell outer surface

255mm

OTA Length

1180mm

Tube Material

Carbon fibre and
Carbon fibre struts

Primary Mirror Dia.

515mm

Primary Mounting

Collimated and Fixed

Primary Material

Schott Suprax

Primary Coating/Shape

Hilux 97%
Ellipsoid

Secondary Mirror Dia.

199mm

Secondary Material

Schott Suprax

Secondary Coating/Shape

Hilux 97%
Ellipsoid

Lens Group Dia.

75mm

No. of Lenses

3

Lens Group Coating

Broadband
AR Coatings

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ODK20 CHARTS (click title to view)

Defraction Limit

Light Path Diagram

Spot Diagrams

Relative Illumination

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Below is an intereferogram of an ODK20 we recently sent to a customer who had insisted on a minimum of 1/6 PV wavefront. He had the instrument tested in an independent optical laboratory and the results showed that there was a deviation (error) of 0.092 microns from perfection. That equates to 1/7 PV wavefront. Strehl was 97.4%.

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