Focus Stage Assembly on its way to the MegaPrime upper end
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To accommodate the changes in focal length of the telescope with temperature,
and the focus position changes induced by the various filters, the camera
must be able to move along the optical axis of the telescope. The focus
stage assembly (FSA) accommodates this motion, supporting the camera and
its shutter on a motorized stage bolted on top of the upper end platform.
In order to follow the apparent motion of the sky due to the Earth's rotation,
two small cameras fix on stars outside of the field of view, providing
automatic guidance of the telescope and measurements of the focal changes.
The FSA is seen here being lifted to the top of the base of the
MegaPrime upper end at the time of the MegaPrime integration. The top of
the wide field corrector will go through its base, and the camera with
its shutter will be fixed on top of the structure.
Credit line: "Canada-France-Hawaii Telescope
Copyright © 2003 Canada-France-Hawaii
Copyright policy and credits related to all press
All images on this page are to be used
the purpose of media announcements related to MegaPrime.
For any other use, please seek authorization from CFHT's PR
Any images used should be credited as follow: "Canada-France-Hawaii
Telescope / 2003"