It seems that lots of DSLR cameras are arrange by their manufacturers so that the shutter button handles both the focusing part AND the exposure a part of taking a photograph. This could be fine, for some time, and you can get fairly adept at subtly pressing the shutter button half way to focus in your goal subject before applying a bit extra strain on the identical button to take the picture. However, there might come a time when this technique ends up costing you useful picture opportunities. For occasion, when doing light portray photography, you’ll be working in relative darkness, taking time to set up your camera and focusing on just the right point within the picture where you need tack-sharp clarity. Then comes the moment when you’ll press the shutter button to start the long exposure so that you can stroll out in front of the camera to …