When the yacht is being observed with the telescope from the shore the scope being used is a Schmidt Cassegrain catadioptric focus with a 90 degree optical back mirror into the eyepiece. Any image being viewed with this arrangement of optics would appear to be upside down and backward. An erecting roof prism would need to be substituted for the 90 degree optical back mirror for objects to appear right side up and properly oriented horizontally.
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05/03/2025 alle ore 09:09
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