Trap Focus

Challenge #20 in the Technology Enabling Art series. Hosted by ProfHankD.
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Trap focus is a camera feature that allows you to manually focus and have the camera delay firing the shutter until you have pressed AND something is in focus. Originally intended to capture photos of the wedding party as they walk down the aisle, it works for many sports if you pre-focus where the action is headed. With a manual-focus lens, you can also use it to confirm focus by holding down the shutter button while you focus -- it will take the image as soon as focus is achieved. Submit your trap focus images here.
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Catch-In Focus Bluebird
by djprd
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My camera on tripod about 12 feet from nestbox was manually pre-focused on a specific area just in front of the nestbox using the camera’s single central focus point and the “correct” exposure was obtained manually as well. My camera was then set on “Catch-in Focus” which allows the camera to automatically take a picture when anything moves into this area of focus in front of the nest box. I was able to keep the shutter button held down from a distance, to allow catch-in focus, using a radiofrequency remote.
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Submitted: Monday, 2nd January, 2012 16:36 (GMT)
Taken: Friday, 17th June, 2011
Focal length: 85 mm
Shutter speed: 1/2000 sec
Aperture: F4
ISO: 800
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