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Said that it was not canon.
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This answer uses information that has been marked as Legends, therefore it is not canon to Star Wars.

(Source: Star Wars Complete Cross Sections: page 11, Technology)

Concussion shields are used to repel space debris, and deflector shields (ray and particle shields) help to protect craft during battle. Ray shields deflect or break up the beams from energy weapons. Particle shields protect against impacts from high velocity projectiles and proton weapons.

Most shields that are shown in Star Wars are "deflector shields", a combination of particle and ray shields. What they are calling "ray shields" in ROTS are actually concussion shields. The Death Star's exhaust port was protected by ray shields, therefore they had to use proton torpedoes to attack it. Only particle shields protect against missiles. Most shields shown in star wars are either deflector shields or concussion shields.

  • Anything that blocks movement, like the shields placed on Obi-Wan and Anakin, is a concussion shield, though they may be a combination of deflector and concussion if they are shown to block blaster fire as well as physical mass.

  • The shields shown in The Clone Wars that protect strategic areas are deflector shields because people can walk through them, but block blaster and cannon fire.

  • Droideka shields and the Death Star exhaust port shields are ray shields that don't block projectiles.

So when people say "ray shielded" in the OT they actually mean ray shields but when people say "ray shields" in the PT they are talking about concussion shields. Hope this answers your question.

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