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PostPosted: Sat Nov 01, 2008 4:07 pm 
Another possibility I can think of is that they might be geostationary satellites reflecting sunlight. Possibly 219 images produces enough light for them to become visible. But these are above the equator so you must have been shooting in the right direction for that to be a possibility.

Ben
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PostPosted: Sat Nov 01, 2008 5:16 pm 
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Thats an interesting theory. I have just processed my Pleiades shots and they are naff!!!! 5 seconds was still too long and the stars were showing signs of motion.

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PostPosted: Sat Nov 01, 2008 6:14 pm 
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I thought about geostationary satellites too. If you look at the trails, you can see three zones. Top left they're bending one way around the north pole. Bottom right they're bending the other way, presumably around south pole. That leaves the bit in the middle which must be the equator. A couple of the spots are there, but there are more at other locations too.

As for Pleiades, I was using 1s at 300mm (600 effective) and that was just showing motion too.

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PostPosted: Sat Nov 01, 2008 7:51 pm 
My thinking behind sensor dust was that possibly light scattering/diffusion/diffraction effects caused by small dust particles that are normally too small to be seen could become visible with the accumulated effect of 219 exposures.

Just a theory.

Ben
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PostPosted: Sun Nov 02, 2008 12:04 am 
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I figured it out now. It's me being stupid. Somehow I had one test shot which was not a part of the sequence in the folder where I kept the images. Rebuilding it now that I've removed it.

Edit: Image in previous post has been updated to remove those blobs.

If this works, click here for a lousy quality video of the shots taken to make the trail. I chopped off a bunch at the start to remove the bright lights. I'll see if I can find somewhere to upload a higher quality version later.

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PostPosted: Sun Nov 02, 2008 10:47 am 
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Thats better. Now the only dots are from planes. The video looks pretty cool, what did you use to make it?

As for Pleiades when we next have a clear night I'll try one second and see what happens.

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PostPosted: Sun Nov 02, 2008 10:51 am 
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Startrails also does videos :)

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PostPosted: Sun Nov 02, 2008 10:52 am 
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ah cool, I might give this a blast as well :-)

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