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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. |
61kg |
Central Obstruction |
39% of the Primary |
Back Focus from |
255mm |
OTA Length |
1180mm |
Tube Material |
Carbon fibre and |
Primary Mirror Dia. |
515mm |
Primary Mounting |
Collimated and Fixed |
Primary Material |
Schott Suprax |
Primary Coating/Shape |
Hilux 97% |
Secondary Mirror Dia. |
199mm |
Secondary Material |
Schott Suprax |
Secondary Coating/Shape |
Hilux 97% |
Lens Group Dia. |
75mm |
No. of Lenses |
3 |
Lens Group Coating |
Broadband |
ODK20 CHARTS (click title to view) |
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%.