http://www.lightstalkers.org/posts/trigger-on-focus-for-canon-slr An entire Lightstalkers thread via RSS/XML. en-us On a Canon 50D or 5D I wish to trigger the shutter automatically when the camera senses something has come into focus. Specifically: - Put the lens in manual focus. - Use manual focus to focus to a depth with nothing currently in it. - Now hold the button halfway and wait. - When something moves into focus field you get a beep and a red outline on the focus box. I want to take a picture triggered on that event. I could use a triggertrap with the audio sensor, and once triggertraps are available again I will get one and try this. There must be other ways to do this also, and I would be interested in other solutions. Thanks, SD Sun, 08 Jul 2012 10:15:08 +0000 http://www.lightstalkers.org/posts/trigger-on-focus-for-canon-slr Perhaps Magic lantern could be what you are looking for: http://magiclantern.wikia.com/wiki/Unified/UserGuide#Focus c/p: Trap Focus: ON/OFF Takes a picture when the subject comes into focus. You need to set the lens to Manual focus (MF) and hold the shutter pressed halfway. Outside LiveView, it only works with lenses with chip. In LiveView it only works for photos, and it will take a picture when the focus indicator has (almost) maximum value on the focus graph. Sun, 08 Jul 2012 10:15:07 +0000 http://www.lightstalkers.org/posts/trigger-on-focus-for-canon-slr#176320