If only Geralt had the ambition to Marty McFly shit for his own personal gain. He could bring the Continent into the 21st Century.

Now it's Kay's turn to look confused. "What the heck's a megascope?" she asks, cocking her head slightly. "You mean like a camera? A... Magical camera?"

That's probably it, right? He said that 'mages' were the ones responsible for running them, so they must be magic.

She is completely missing the point that Geralt clearly doesn't know what a camera is, either.