New answers tagged bulb-mode
Generally you should use a remote shutter release to hold the shutter open for a prolonged period. This also prevents camera-shake that is usually associated with touching the camera while taking a long exposure. Several options are available from simple lockable switches to complex intervalometers. Each have their own advantages but to get started a cheap ...
You can use CHDK or Cannon Hack Development Kit. I am using it on my SX50. You can get clear instructions on my blog You can also check out my photos on Flickr
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