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Here's what TRACK looks like

Posted: Mon Nov 20, 2006 1:55 pm
by ERSTRS
These movies were judged as "correct" when I read them. Therefore, I thought I'd pass them on to those who are having difficulty in deciding what a Track looks like. In my experience, a track is ALWAYS in focus at bottom of focus lines. If a particle IS in focus on the bottom, but is a black dot that balloons out when you scroll up the lines, then it is NOT track.

Here are the examples that were judged correct for me:

Small track, lower right corner
http://stardustathome.ssl.berkeley.edu/ ... rds=?-1,-1

Obvioius CM track on left side above middle
http://stardustathome.ssl.berkeley.edu/ ... rds=?-1,-1

Obvious CM track upper right hand corner. (CM track are various sizes)
http://stardustathome.ssl.berkeley.edu/ ... rds=?-1,-1

Small, odd looking track in upper half of sample, in middle
http://stardustathome.ssl.berkeley.edu/ ... s=?208,330

NO track in this one
http://stardustathome.ssl.berkeley.edu/ ... rds=?-1,-1

ERSTRS

Here's what a teensy-tiny Track looks like

Posted: Tue Nov 21, 2006 7:25 am
by ERSTRS
I found this one this morning (11-21-06) while dusting and almost missed it. Focus all the way to bottom of focus lines and you'll see it near the center of the lower left quadrant. It is the only spot that is in focus. Notice that it appears dark without a light center, and when you focus slowly upward, it appears to "disentigrate" into fragments.

http://stardustathome.ssl.berkeley.edu/ ... rds=?-1,-1

ERSTRS

Posted: Tue Nov 21, 2006 8:46 pm
by the moon
Don't forget that these test movies aren't real tracks. The surface part of the tracks that are pasted in often don't match up with the surface of the rest of the movie. A real track in a movie that focuses deep enough might disappear before the bottom frame.