Used to take great photos. Now lots are blurred.
Camera or hand shake are the most common cause of blurry photos, long exposure needs slower shutter speed, this is happened when your subject have inadequate light, and during this process, the camera sensor/shutter is open, causing the resulting photo to be blurry, because even a single movements of your camera or hand will cause the camera sensor to move, that causes a blurry capture. In order not to experience this, you have to be familiar with the setting of your camera, there are 3 important settings you have to understand: ISO Setting, Shutter Speed, and the Aperture Setting, they are related with each other. ISO Setting, is the sensitivity of your camera to light, meaning the higher the ISO, the more sensitive your camera in light, and the more sensitive, the faster your shutter speed. ISO scale from 100, 200, 400, and so on, depends on the cameras specs. Shutter speed, is the speed of the opening and closing of the camera's curtain( e.g. 1/30, 1/60 of a sec....and so on) and Aperture is the opening size of your lens focal points (the lower the f, the wider the opening: f1.4, f1.8, f2.0, f2.8, f3.5, f5.6, f8, f11, f16, f22, f32
I hope this will be helpful.