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This is true. In fact, the script specifically describes how Darth Vader is constantly adjusting his targeting computer to acquire a perfect lock: ----------------------------------------- INT. DARTH VADER'S COCKPIT Vader calmly adjusts his targeting computer and pushes the fire button. ----------------------------------------- That's how he shoots everyone down so easily. He relies on his superior targeting technology. That's also why Anakin's first line in 𝘙𝘦𝘷𝘦𝘯𝘨𝘦 𝘰𝘧 𝘵𝘩𝘦 𝘚𝘪𝘵𝘩 is "Lock onto him, Artoo," followed by a sequence of shots prefiguring the role he will play as Vader in the Death Star battle. Anakin is already relying more on technology to "lock onto" things. Right now it's Artoo, who is benign. But in the future battle of the Death Star, Luke will be deprived even of benign technology—because Vader locks on with his targeting computer and hits Artoo.