I have my DIY laser trigger for the Nikon D300s up and running. A Parallax Basic Stamp controls a small laser, a photo-resistor, and an optoisolator (NTE3222) to the camera release. The laser bounces off a small mirror to the photo-resistor, and the camera takes a photo when the beam is broken. The design is a collection of ideas I've been reading about, and parts I have.
In software I need to calculate the ambient light value with the laser off, then calculate the value with the laser on; this creates a perceptible blinking. I'm starting to think it would be faster if I replace the photo-resistor with a photo-transistor. Every millisecond counts with subjects racing through the frame.
The laser must be aligned with the mirror and the photo-resistor. For this reason, a really bright laser would be very helpful when trying to line things up in daylight. I turn it off right before the camera release, so it won't appear in the photograph.
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