Originally posted by internos
but i find very unusual the dark track following the object
i know the phenomenon.
i think the bright object with dark trail is just a bug
, flying very close to the lens.
The image is taken at evening, in low light situation. The flash fired, like ussually automatic settings do in this situation. The duration of the
flash is very short, maybe 1/500 sec. So, it shows a very overexposed freezed thing, because is close to the camera and the flash light is strong. The
total exposure time of the shot is ussually much longer than the duration of the flash, about 1/30 sec, more than 15 times long, and during the
exposure time, the flash was finished already "long ago", so, only the surrounding natural light is captured, or the bug moving here (motion blurry
Below is an older experiment exposing a button suspended on a string, having a pendulum motion.
First photo, using flash, like ussually cameras are doing with automatic settings:
or direct link: files.abovetopsecret.com...
relevant EXIF data:
Model - Canon PowerShot S2 IS
ShutterSpeedValue - 1/30 seconds
ApertureValue - F 4.51
Flash - Flash fired, compulsory flash mode, red-eye reduction mode
of course, we shoud ignore the string.
the second photo, taken without flash, and with the button not moving, to understand what it is really there:
or the link: files.abovetopsecret.com...
ExposureTime - 1/100 seconds
FNumber - 3.20
Flash - Flash not fired, compulsory flash mode
As many times, technical facts fooling us.
[edit on 7/10/09 by depthoffield]