Re: Long digital exposures?

[Don Roberts <droberts@xxxxxxxxxx>]

I was going to ask about layering multiple exposures.  You would not get the blurred figures that sometimes show up in the film images but you might see faint ghost images.  Has anyone tried many multiple exposures like this?
Don

David Dyer-Bennet wrote:

On Wed, November 19, 2008 08:35, Edwin Blenkinsopp wrote:

  

The problem is, of course, digital noise. Aside from noise reduction
software is there a digital technique, perhaps used with the better
cameras, that allows noiseless, minutes long, digital exposures?
    

Amateur astronomers working digitally seem to like layering multiple
shorter exposures to produce a final result.  Noise, being, random, will
tend somewhat to cancel out, plus they're running the sensors at a lower
duty cycle so they shouldn't heat up as much.  I haven't tried this
technique myself, I'm not sure what you could do with it for pictorial
photography.