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Topic: Photography and LED- PWM-flash ? (Read 2002 times) previous topic - next topic



I have very little experience with photography, but  recently got an older DSLR-camera (Fuji Finepix S3) and a nice set of lenses.
At http://photoduino.com/ I found a nice project using sensors to operate the camera and use it for time-lapse video, highspeed triggering, etcetera.

Looking at it's gallery, http://www.flickr.com/groups/photoduino/pool/ , a lot of the "high-speed" (or just timed right)  photo's seem to be shot with coloured flash-light and I wouldn't mind creating one..

I know how to light an RGB-led in a specific colour, but wonder whether the PWM-technique and short amount of time a shutter is open won't give problems. If I would set the flash to x% red, y% green and z% blue, I'd like to see about the same percentages on the photo. If the shutter is open for a longer period, that probably won't pose a problem, but I would like to know whether it could at shorter shutter times.

I personally also was very impressed when I saw a 10-watt Led burning at full-power for the first time. I know I can set sensitivity of my camera using the ISO-settings, but  wonder what type of led(s)  (lumens/power) would be good enough to use, if the idea of using an RGB-led and PWM is... a good one at all.

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