Pro-democracy protesters in Hong Kong have been using laser pointers to distract police officers and confuse facial recognition cameras. But while they are beating facial recognition, they are also causing more serious problems for police officers and photographers covering the protests. The laser beams have caused eye damage to several people so far, and they have been frying camera sensors as well.
Light painting is typically done one of two ways. Either you have a flashlight and wave it around your scene from behind the camera to light up your subject over time or you have the light source actually in the scene and you’re creating a long exposure of its movements. But there are many light sources besides flashlights that you can use for light painting. In this video from COOPH, we take a look at five ways to paint with light.
It’s not a secret that things like lasers and lidar can kill camera sensors. You get an intense beam of light pointed towards your camera, and then the lens focuses it into an even brighter point, frying pixels. But did you know that diffused reflected laser light can also cause this to happen?
Photographer Andy Boyd knows. He had to learn the hard way after filming a laser tattoo removal which very quickly and easily fried a bunch of pixels on the sensor of his Sony A7SII in a series of rapid laser bursts.
When the clouds evaporate and your DVD, Blu-Ray and hard drive backups are no longer readable, what are you going to do about accessing your data?
Valuable personal images might be gone forever (of course, that’s also a good argument for printing your photos), or perhaps you shoot for a living, and keep a permanent archive of all your work.
It’s a lot of hard work to maintain reliable digital backups and to keep shifting all your data from one storage medium to the next generation every few years – especially when some hard drives might not be as reliable as we were led to believe, and cloud services have the potential to accidentally delete data at will.
Scientists at the University of Southampton seem to have found a potential answer for the issue of long term storage, in the form of small glass discs.
If internet anecdotes are anything to go by, laser pointers are good for nothing more than endlessly teasing your cat. But, as this video shows, it appears that isn’t the case.
One of the biggest obstacles of taking good astronomical photos is light pollution, this is why almost every tip article on night photos has a tip about getting away from the city. But what if you want to take photos in your driveway? In that case, street lights will most probably kill each and every one of your photos.
Astronaut Don Pettit (previously) has a neat little trick he uses to shut down that annoying street light he has just outside his driveway. He points a laser at the street light sensor which tricks the street light into thinking that it is still day outside and preserve energy by shutting down.