I'm about to start exploring the world of long exposure shots, using my Canon EOS M. The camera has a standard max exposure time of 30 seconds, but in bulb mode I can keep the shutter open indefinitely (using a wireless remote to control the shutter.)
How long can I leave the shutter open without running the risk of prolonged exposure to light damaging my sensor?
For the purposes of this question assume I'm shooting in summer daylight, so that we can go by the worst case.
Answer
As long as you aren't pointing the camera at the sun, lasers etc. (see this question)
You should be ok, at worst you'll get a completely over exposed image and the camera may give an over heating warning or the battery will run flat.
This is based on the general consensus (google to the rescue):
Almost certainly if your final result is correctly exposed you have nothing to worry about.
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