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I have a friend who photographs theatrical productions. He gets problems with colour banding and colour variation, which we both agree is caused by the fact that his shutter speed is a fraction of the electrical mains frequency. He can't shoot at 1/50th, which would eliminate the issue, because of subject movement.
In the "old" days when theatres used tungsten lights, this issue was more manageable. Tungsten lights had a very predictable response to the AC cycle, and if he caught a shot at the "wrong" part of the cycle it would be under-exposed and possibly a bit too warm - both of which could sometimes be corrected if the shot was otherwise good and worth trying to save. However the situation with LEDs seems to be much more difficult. White LED light is created by using red, green and blue LEDs, and they seem to have slightly different electrical characteristics, so at different points in the AC cycle he's seeing variation in colour as well as variation in brightness.
Can anyone suggest a solution or a workaround?
Or failing that, can anyone point to a good source of information regarding the characteristics of the sorts of LED lights that are used in theatres, so that we can study it and look for possible workarounds ourselves?
Thanks for your help.
In the "old" days when theatres used tungsten lights, this issue was more manageable. Tungsten lights had a very predictable response to the AC cycle, and if he caught a shot at the "wrong" part of the cycle it would be under-exposed and possibly a bit too warm - both of which could sometimes be corrected if the shot was otherwise good and worth trying to save. However the situation with LEDs seems to be much more difficult. White LED light is created by using red, green and blue LEDs, and they seem to have slightly different electrical characteristics, so at different points in the AC cycle he's seeing variation in colour as well as variation in brightness.
Can anyone suggest a solution or a workaround?
Or failing that, can anyone point to a good source of information regarding the characteristics of the sorts of LED lights that are used in theatres, so that we can study it and look for possible workarounds ourselves?
Thanks for your help.