Why do I get lots of noise in my photos on the D30 at long exposure times with 100 ISO speed? Help!

[Monzer]

So I'm using a Canon D30 (3.1 megapixel). My ISO speed is set to 100, but when take phots at very slow shutter speeds I get a lot of noise. And I mean a lot. Can anybody help?

[ScottyP]

Long exposure time is the 2nd main way to get noise in an image.  Not a lot you can do other than post processing.  How long an exposure?  Perhaps a compromise like ISO 200 and a shutter that is half as long (twice as fast) would be slightly better if you played around with it.  Or perhaps that would be even worse.

[TCampbell]

There is a relationship between sensor temperature and noise. Long exposures heat up the sensor and generate more noise.

When I do imaging (lots of long exposures) the sensor will get quite warm because it doesn't get a chance to cool off much between images.