Wonders of active optics: astigmatic

The video shows the effect of astigmatism of the primary mirror. The stellar images change from a line to a square and then to a line in the perpendicular direction. This is caused by the secondary mirror moving back and forth along the optical axis.

Credit:

ESO

About the Video

Id:eso9940b
Release date:13 August 1999
Related releases:eso9940
Duration:10 s
Frame rate:30 fps

About the Object

Category:Paranal

Legacy Videos

Legacy Video
1.8 MB

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