My 50D can't be photographed in the dark, and the flash keeps flashing? What's going on here?

In principle, it is too dark for the camera to recognize the subject and focus. Strobe means that the camera should illuminate what you are shooting to achieve the purpose of assisting focusing. Second, technically, you can usually help the camera focus after stroboscopic, but you still can't shoot it, which means you may not have mastered the basic technology of focusing. In the brief moment when the flash flashes, the autofocus fails and the shutter cannot be pressed.

Focusing needs to pay attention to two basic problems: 1) The shutter of digital machine basically belongs to the so-called "secondary shutter". That is to say, when taking pictures, aim the lens at the subject to be photographed and gently press half a shutter (once; At this time, you should hear the "beep" sound of successful autofocus or the indicator light), keep pressing your finger, slightly move the adjustment picture as needed until the composition is appropriate, and continue to press the shutter to the bottom (twice) to take pictures; 2) autofocus: which brand of camera autofocus is basically like this. Beginners need to pay attention to the operation essentials of autofocus: it is too smooth, it may be out of focus without obvious color, and there are other foreground objects in front of the subject. Usually the focus box in the middle will have vertical lines or color boundaries, which will make it easier to focus. Solution: 1, if you shoot the sky, find the edge of the white clouds and press the shutter for half a minute, then don't let go, slightly adjust the composition and continue to take pictures by pressing the shutter; 2. If you take a picture of the scenery, choose the scenery mode from the menu to take a picture, because the focus setting is far away, which is generally acceptable; 3, shooting other, pay attention to the law that using vertical lines or color boundaries in the middle of the focus frame will make it easy to focus. If necessary, you can focus on other items with the same distance from the object being shot, and then shoot. The winner can turn the camera 90 degrees to lock the focus and then turn back to the original position to shoot. As long as the finger locked by the shutter in the middle is not loose, it will be successful, and you will master it after several experiments.