Well, it is quite simple really.
A must-have to accomplish this is a tripod. This will ensure that your camera stays as steady as possible because you will need to slow your shutter speed way down. If you attempt to hold the camera yourself, everything will be a big blur.
Depending on how light or dark it is outside, you'll need to adjust accordingly. In basic daylight, I usually start with this setting:
* Exposure: 3.5 seconds
* F-Stop: 22
* ISO: 100
If its getting close to sunset, then I start with:
* Exposure: 8 seconds
* F-Stop: 11
* ISO: 100
* F-Stop: 11
* ISO: 100
As you are taking the picture, play with the settings and see how far you can push it. For example, an extra second longer exposure can give your photo a completely different look. The end results can be breathtaking.















