REMOTE RELEASE
For exposures longer than 30s, it is highly likely that you will need a remote release
On the majority of cameras, the longest exposure time setting is 30 seconds. Switching to Bulb (B) mode will enable you to take longer exposures, but unless you have a very steady hand and finger on the shutter button, you will need something attached to the camera to trigger the shutter to open or close. Devices range from £10 to £300, and some can connect your camera to a smartphone for enhanced control.