O'Reilly logo

Canon EOS 40D Guide to Digital Photography by David D. Busch

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Update Your Firmware

As I said, the firmware in your EOS 40D is the camera’s operating system, which handles everything from menu display (including fonts, colors, and the actual entries themselves), what languages are available, and even support for specific devices and features. Upgrading the firmware to a new version makes it possible to add new features while fixing some of the bugs that sneak in. For example, a firmware update for the 20D added the ability to use the WFT-E1 wireless file transmitter.

Sometimes firmware updates happen during product development; I received my EOS 40D a few weeks after it was introduced, and it already had firmware Version 1.0.3 installed. Even more interesting are some of the “bootleg” firmware upgrades that ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required