I know this is a little bit off topic from Arduino, but I will be using my Uno. I'm planning to use a 1w IR 808nm laser diode to assist with AF on my Canon DSLR. These are available on Ebay for less than $15. It would give Auto Focus an infinite range in complete darkness. Anything past the range of the laser would be almost infinity as far as focusing is concerned. I have a few questions for you photography buffs before I begin.
Will 808nm work for focusing? I've googled and near-IR is typically used.
Will pin 1 of the hotshoe turn on the laser at the correct time?
Will this wavelength have a huge effect on exposure in the dark? If so we have a night vision video camera!
My Uno will only have a simple task. To delay the timing from pin 1 so it won't interfere with the picture. Also to keep the diode from overheating without a big heat sink. I need to keep track of how long it was on in the last minute. Or use a thermistor?