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| Flash duration issue with AB800 http://paulcbuff-techforum.com/viewtopic.php?f=8&t=632 |
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| Author: | jmphoto [ Sat Jun 05, 2010 6:03 pm ] |
| Post subject: | Flash duration issue with AB800 |
Yesterday I was shooting BMX with one of my friends. Usually my AB800 at full power is fine for freezing bikes in motion, but this time I got a lot of motion blur around the back wheel. This was shot at full power on the 800.  I know the t.1 is 1/1100, but the specs say that flash duration is worse as you power down. What can I do? |
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| Author: | shOo [ Sun Jun 06, 2010 1:22 am ] |
| Post subject: | Re: Flash duration issue with AB800 |
so did you shoot it at full power or not? ambient light might cause motion blur, since the sun is quite strong. |
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| Author: | CreV [ Sun Jun 06, 2010 3:05 am ] |
| Post subject: | Re: Flash duration issue with AB800 |
Flash duration may be 1/1100 but your shutterspeed is not that fast.. The flash may cause the subject to freeze but the ambientlight will still be a major part of the exposure and that also causes motionblur. Here is why: 1/250 = 4ms Shutter opens, Flash takes 1ms, since there are ~3ms left of the exposure rider has time to move and cause motionblur. Only way to reduce the amount of motionblur is to use a higher shutterspeed but that will also cause a black ugly bar in your picture. Here is a great guide how to push your shutterspeed. http://themgoods.com/forums/phpbb3/view ... 0e02adc51c Be creative.. You may need to photograph upside down ;) |
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| Author: | rms956 [ Sun Jun 06, 2010 12:26 pm ] |
| Post subject: | Re: Flash duration issue with AB800 |
Also shooting later in the evening will help. RMS |
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| Author: | jmphoto [ Sun Jun 06, 2010 11:06 pm ] |
| Post subject: | Re: Flash duration issue with AB800 |
Yes, this was shot at full power. I'll remember the ambient light level next time. |
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| Author: | Luap [ Mon Jun 07, 2010 12:07 pm ] |
| Post subject: | Re: Flash duration issue with AB800 |
Judging from the exposure on the trees not lit by flash I would say the blur is from the ambient light. A Nikon D40 type CCD camera is the real answer for this type of shot since you can use shutter speed of 1/1000 to 1/2000 or so and still capture all the flashpower and block out the ambient. |
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