I think you've got it!thederek wrote:I'm convinced it's a bug!
maybe that sounds too simplistic, but i think it is quite realistic.
1. right coloring for a small gnat or mosquito.
2. that is about the distance a bug could fly in about 1/20th of a second (i think, it kinda depends on the distance from the lense that the bug was flying)
3. that clearly explains why it wasnt in the picture before or after.
4. its easy! and obvious!
The images still have the EXIF info from the Canon Powershot G3 camera used. Included in that info is the fact that the flash was fired for each of the images (not sure why flash would be used in this situation, but perhaps part of the automatic functioning of the camera)
I suspect an insect flying by close to the camera - and thus out of focus - left the darker shadow during the 1/20 second exposure, and then was illuminated by the very brief (usually well under 1/1000 second) strobe of the camera's flash.
Depending on whether the camera fires its flash at the end or the beginning of the exposure, you might need to reverse the order of my time line above...
A very similar situation to the silly fervor over 'Rods' a few years ago, where a whole new crop of 'theories' about interdimensional alien intruders was created to explain what was in fact insects flying in front of cameras... ;^)