Custom Function 19

January 13, 2009 ·

Michael Reichmann

Custom Function 19

What Is It?

The ultra telephoto L-series Canon IS lenses, launched in July 1999, have a new function called "AF Stop" with four "AF Stop" buttons on the lens. The EOS 3 can use these new AF Stop buttons for other functions by setting CF19 (custom function). CF19 is, however, not incorporated into the cameras as shipped from the factory, so the setting must be done at Canon service facilities.

Custom Function 19 Details:

CF19-0...By hitting the AF stop button on the lens you will stop the AF drive.

CF19-1...By hitting the AF stop button on the lens you will activate the AF drive.

CF19-2...By hitting the AF stop button on the lens you will activate AE lock.

CF19-3...By hitting the AF stop button on the lens you will activate a change in focusing point selection, I.E., you can switch to manual or auto or eye control.

CF19-4...By hitting the AF stop button on the lens you will be able to select the AF mode by changi...

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Michael Reichmann

See all articles by Michael Reichmann

Michael Reichmann is the founder of the Luminous Landscape. Michael passed away in May 2016. Since its inception in 1999 LuLa has become the world's largest site devoted to the art, craft, and technology of photography. Each month more than one million people from every country on the globe visit LuLa.