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Super Audio CD
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=== Disc reading === [[file:Sacd.svg|thumb|A hybrid Super Audio CD uses two layers and the standardized [[focal length]] of conventional CD players to enable both types of player to read the data]] Objective lenses in conventional CD players have a longer working distance, or [[focal length]], than lenses designed for SACD players. In SACD-capable DVD, Blu-ray and Ultra HD Blu-ray players, the red DVD laser is used for reading SACDs.{{citation needed|date=March 2022}} This means that when a hybrid SACD is placed into a conventional CD player, the infrared laser beam passes through the SACD layer and is reflected by the CD layer at the standard 1.2 mm distance, and the SACD layer is out of focus. When the same disc is placed into an SACD player, the red laser is reflected by the SACD layer (at 0.6 mm distance) before it can reach the CD layer. Conversely, if a conventional CD is placed into an SACD player, the laser will read the disc as a CD since there is no SACD layer.<ref name=extremetech2001/><ref name="muszeroldal"/>
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