I'm not sure the specific advantage that a configurable, tactical laser reticle can offer your photography other than turning a photo shoot into a photo shoot.
But maybe that's your thing.
Slipping into any camera's hot shoe mount, this 'Wildlife Photography with Tactical Four Reticle Sight' allows you to frame your subjects the semi-lethal way, with either red or green lasers marking a point, circle point, circle cross or cross, just like your favourite Tom Clancy novel. And don't worry, since the laser is integrated solely into the optics, those pesky red dots won't appear anywhere in your picture.
Available now for $US40 - it's perfect for headshots. [Brando]