Using Manual exposure

If you find you usually stick to the auto exposure modes, a project like this offers a gentle introduction to Manual exposure mode. In order to get the long shutter speeds we need, we have to adjust our other exposure settings to compensate. Firstly we can use a high f-number like f/16. This decreases the size of the opening in the lens and restricts the flow of light. Secondly, we can use a low sensitivity, such as ISO100, so the sensor requires more light for a correct exposure. Both of these factors help to restrict the amount of light, which means we can use a longer shutter speed.