費城!
This is what the DSLR manual will call "more advanced techniques".
*shrugs*
Well, I don't know anything about that. But, it's tricky, and I'm still learning it.
It's a setting on the DSLR (Canon Rebel XS) called "Tv".
Generally, the manual instructs users to try this with running water, like water fountains and waterfalls, and I often see this effect on running water to give it a foamy look. But, the manual says it can be used for motion blurs on stuff like running children, or whatever.
The trouble with it is that it has a tendency to white wash everything, especially in direct sunlight. So, I haven't quite figured it out entirely when programming the camera. My only trickity-lil-trick so far is to just shoot in ambient daylight, like cloudy or partly cloudy when a cloud blocks the sun. Unless I figure out a better way to program it. (Still learning.)
I still haven't tried it at night yet, either. But, I would like to. So, these are all just experimental for me.
To give you an example of just what exactly this is, I'll show a comparison:
Without "Tv"
With "TV"
With "TV"
Hopefully this explains it better than words. But, you can also tell how much brighter the "Tv" makes it. Since I shot these when a giant cloud blocked the sun for a while! Also, it MUST be shot on a tripod with a remote. Mine is an old vintage tripod, so it's wobbly! So, I have to stand there, brace the tripod, and shoot several frames in order to get it something right. Anyways, like I said: I'm still learning....
Sunlight with cast shadows/shade
Cloud blocking sunlight ambient light
Foamy swirls
