22
votes
Why doesn't a shutter speed of ¹⁄₂₅₀th freeze motion when a flash of that duration does?
I just read that a normal flash illuminates a scene within a 1/250th of a second. (A flash would keep the scene illuminated for a 1/250th of a second, right?
In general, that's wrong.
Flash duration ...
- 8,514
9
votes
Why only camcorders that cost too much can record high fps (freeze motion)?
So, why a dark place and a flash is to be required to freeze the motion (take a high speed photo) though in a bright place with a, say, 1/4000th of a second, we can take a high speed photo?
This is ...
- 31.7k
6
votes
Why only camcorders that cost too much can record high fps (freeze motion)?
Because there's a lot more to "taking a photo" than just opening and closing the shutter. The data has to be read off the sensor, processed to a greater (JPEG) or lesser (RAW) extent and a greater (...
- 21.9k
6
votes
Why doesn't a shutter speed of ¹⁄₂₅₀th freeze motion when a flash of that duration does?
I just read that a normal flash illuminates a scene within a 1/250th of a second. (A flash would keep the scene illuminated for a 1/250th of a second, right?
Sort of, depending on the specifics of ...
- 31.7k
5
votes
How to take shots like this
No need for post processing.
Relative to the camera, the motorcycle and rider are not moving (unless the rider waves the selfie-stick) so they are sharp. The background (clouds and landscape) are ...
- 21.3k
3
votes
Why only camcorders that cost too much can record high fps (freeze motion)?
The refresh rate aka readout speed (basically how quickly the sensor spits out all the data from the current frame and is ready to record the next) of most sensors is surprisingly slow. So slow that ...
- 562
2
votes
Accepted
What problems might there be with using a laser as a flash source for high speed photography?
Are there any examples of using laser as a precise flash source for photography?
Yes. Laser light sources are used as "flash" of a duration down to a couple of femtoseconds. However the setup isn't ...
- 514
2
votes
Why doesn't a shutter speed of ¹⁄₂₅₀th freeze motion when a flash of that duration does?
The question seems to make an incorrect assumption: that at a sync speed of 1/250 second the entire sensor is uncovered at the same time for 1/250 second. This is not the case. Most of that time is ...
- 175k
1
vote
Are there any high speed video cameras that use sub-microsecond shutterspeeds?
so many cams with sub microsecond shutter---photron down in 100 nano scale. problem is cost---unless this is a job, you won't like spending 20k plus. there are other ways to do this but depends on ...
- 11
1
vote
Accepted
Effective pixel readout pattern
The various digital cameras I've owned all read out the central block of pixels. This is not particularly surprising if you consider the what actually happens if you try to read out scattered pixels. ...
- 1,887
1
vote
Why doesn't a shutter speed of ¹⁄₂₅₀th freeze motion when a flash of that duration does?
1/250 is the time that it typically takes for a mechanical shutter curtain to travel from one end position to another. So for any faster shutter speeds, the closing curtain has to start moving before ...
- 32k
1
vote
Why doesn't a shutter speed of ¹⁄₂₅₀th freeze motion when a flash of that duration does?
Your understanding of how a flash works is wrong.
The flash duration is more in the range of 1/1000 to 1/8000. Due to physics and the design,the shutter needs to be open longer 1/1000 in order ...
- 12.2k
1
vote
How can I capture the movement of a bullet?
If you move away from main stream xenon flashes & have a look at air gap flashes they can hit 1/1,000,000 of a second. Plans on the internet are DIY (REALLY dangerous stuff) but there may be ...
- 61
1
vote
How do I lengthen shutter speed with out washing out the picture?
A combination of probably at least two or three of the following:
Lowest ISO possible (lower numbers = less sensitivity to light)
Stopped-down aperture (higher numbers = less light gets through the ...
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