Image quality

Focus FWHM
Primary 0.175''
Opt Cassegrain 0.131''
IR Cassegrain 0.150''
Opt Nasmyth 0.160''
IR Nasmyth 0.177''

This table lists the image sizes (FWHM) obtained at each of the Subaru Telescope's foci. The Primary and Cassegrain foci images sizes include tracking errors.


The plot below shows probability of good observing condition for each month. The Seeing statistics page shows further details.

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