How to Make Indoor Photography Not Blurry I am a beginning photographer with a Canon Rebel XTI. I'm trying to get indoor portraits of my son, but I can't seem to get non-blurry photos because the shutter speed is too slow as I need to let the light in, however he is moving thus causing the blurriness. Whenever I change the shutter speed, the photos become too dark. If anyone has any tips, techniques or settings on the camera they could suggest that would be most appreciated. Maybe I need a different lens?   Thank you!
What do I need in a camera to take non-blurry photos of a fast-moving child? I'm a mom who is obsessed with taking photos of my now 2 year old daughter.  I currently have a Nikon j1 which I like, but I find the shutter speed is still a bit slow and when you're trying to take photos of a speedy little girl, I end up with a lot of blurry images.  So I'm looking for a camera with a very fast shutter speed that will allow me to take good photos of a very fast moving child.  Also that can take photos in low light. I've been looking at the canon eos rebel but I'm not sure. Would like it to be able to take videos as well. Any advice?
Speed of light when accelerating I'm studying special relativity and saw the 2 postulates of Einstein. The most remarkable one for me is the universal speed of light. Einstein postulated that the speed of light in vacuum is the same for all inertial observers, regardless of the motion of the source. But what if we are accelerating and we are changing from one inertial frame to another, how will we observe the speed of light? Is it still the same? I suggest it's not? Because I alread saw a small introduction to general relativity where the light will bend in a gravitational field and therefore also when you accelerate. So does the speed of light change because it bends?