When I took mine apart found they used a small camera with a large plastic cover, I was able to correct what it was shooting at by changing the stop point. As long as you get one made for outdoors it should work. If you change to digital you probably can get a new digital monitor for the same price.
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.