Hi i found this as i was researching timelaps for a 2 month project i am making using time laps. I should get some new software for my DSL cam soon so ill make some cool Time laps films Of where i live Shud be cool. anny one else on sift into this it would be cool to see where people live in time laps .

I dont understand why it apears that aload of the stars stay still must be dirt on the screen ore something.

Weird - looks pretty tightly focused to be dirt on something so far from the focal plane. Maybe sensor crap?

Either noise, reflections or hot pixels or the person who made this originally accidentally layered something over the original video.

Westy, I been filming timelapses for a while now in Montreal. However I am having problems capturing long periods of time because my suspiciously new DV camera doesn't even possess a timelapse function. And interval recordings look like shit if even the smallest amount of movement if made making it record and stop all the time. I been thinking of hooking it directly to my PC and out the window, however the -30 or some weather makes that an impossibility at the present.

Ah your titles and your post, like glimpses of coherence blinking in and out.

Yes, the dots that don't move are light sensor 'noise' from long-ish exposures with a consumer grade digital camera. Actually, even very expensive digital cameras will have this problem with long exposures (5-30 sec). It has to do with a dark signal (low-light) being recorded differently by some sensors due primarily to electrical noise and differences in the light sensitive photosites (... this is my understanding at least).

If you also have the same problem with low light images on your own project (which you very likely will) and if you were so inclined you could apply a median filter to all images before making them into a video clip ( http://en.wikipedia.org/wiki/Median_filter ). You'll have to monkey with it a little if you're shooting something like stars, though.

Photoshop and other photo editor programs can do this for you, by 'recording' what you apply to an image, then tell it to apply the same recorded technique to all images in a folder (so you really only do it once, then go and make some dinner).

I would also advize setting the exposure manually, if you can, at a level that permits enough detail in low-light but also avoids collecting piles of background noise.

An aside; digital cameras with physically large image sensors are said to be better at avoiding noise problems (so a 7MP camera that has a very small chip will be much noisier than a 5MP camera with photosites that are physically larger and spread further apart).

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