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The SST is a vacuum telescope - meaning that it is evacuated internally to avoid disruption of the image from air inside. This is a particular problem with solar telescopes because of the heating from the large amounts of light collected being passed on to any air causing image degradation.
The SST superseded the SVST - the Swedish Vacuum Solar Telescope, which was 47.5cm in diameter.
Information on the SST from the Institute for Solar Physics