The Dorr Wireless Remote Control 16C Sony 20 for cameras is great for long exposures as they require a vibration-free release. Any pressure on the cameras trigger can cause camera shake, so a quick solution to this is a remote release which is easy to use and very relaible. The Dorr Camera Wireless Remote Control for the 16C Sony 20 has wireless transmission by radio in 16 channels to avoid interference by outside anomalies and it has a range of upto 15m. For a full list of compatible cameras, see the specification tab.
