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Related to Cassegrain focus: Coude Focus, Reflecting telescopes
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In Sturmann's relay system, the light from the 100-inch telescope reflects off a 6-inch flat mirror before the Cassegrain focus.
We also plan to install a CCD camera with a bigger chip (with 7,000 by 4,000 12-micron pixels) to capture an even larger field of view (60 by 34 arcminutes) at the scope's Cassegrain focus.
As seeing and transparency changed or celestial surprises emerged during the night, they changed saddles, switching from the Cassegrain focus to the coude, or slewing across the sky to an unscheduled target.