I'd never seen this, but apparently it's from a letter written by C.S. Lewis in 1959:
As things worked out, I wasn't free to hear a single instalment of our serial [The Magician's Nephew] except the first. What I did hear, I approved. I shd. be glad for the series to be given abroad. But I am absolutely opposed ”“ adamant isn't in it! ”“ to a TV version. Anthropomorphic animals, when taken out of narrative into actual visibility, always turn into buffoonery or nightmare. At least, with photography. Cartoons (if only Disney did not combine so much vulgarity with his genius!) wld. be another matter. A human, pantomime, Aslan wld. be to me blasphemy.
Link.
Interesting stuff, though I suspect Lewis didn't have in mind today's technological capabilities.
