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Old Sep 20, 2010, 2:13 PM   #21
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Hey Mark, that post was very helpful. So first off, you are using the flash on the camera, right? The thing I was confused about was why is the second picture you posted taken at 1/60 with the flash blurred, and the one at the bottom with the slower shutter speed of 1/20 with the flash is not blurred? What factor in there made the slower shutter speed less blurry than the faster shutter speed?
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Old Sep 20, 2010, 2:39 PM   #22
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The first two are both taken in P mode so the camera is aiming for an ambient light exposure, with the 2nd then the flash is just added and will fill in any shadow. Going further down I take more control over the camera so I'm setting different exposures to allow me to under expose with no flash then using the flash to freeze the action. If you don't under expose without flash (by a few stops) then you will still get blur.
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Old Sep 20, 2010, 3:33 PM   #23
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Oh ok, that is good to know. I will try messing around with underexposing using the flash and see what happens. It makes sense to me that a fast shutter speed would freeze the action thus not allowing blur, but I guess I don't understand how a flash can freeze the action. If the shutter is still open longer, how does that work to eliminate blur?
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Old Sep 20, 2010, 4:16 PM   #24
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Quote:
Originally Posted by dj76 View Post
Oh ok, that is good to know. I will try messing around with underexposing using the flash and see what happens. It makes sense to me that a fast shutter speed would freeze the action thus not allowing blur, but I guess I don't understand how a flash can freeze the action. If the shutter is still open longer, how does that work to eliminate blur?
It's all in the other thread, but possibly needs reading through a few times more. The flash pulse is really really fast, depending on the unit and the power used you are looking at 1/10,000s or more faster than the shutter speeds on the majority of dSLRs so the ability to freeze the action is high. As long as there isn't enough light without flash then it is pretty much only the flash doing the work so you are getting a similar result to a very high shutter speed. The closer you get to a normal exposure without using flash (before flash is added) then the less work the flash is doing so you might see some blur. It's a case of getting enough ambient light in for what you want combined with the flash to freeze the movement.

I suggest reading that thread through a few times. Looking carefully at the exposure settings as I move around the shutter speeds, the aperture and the ISO at different times, so it is important to understand their function in all of this as well, but hopefully after looking a few more times it will all make sense, especially if you put it into action and try different things yourself.
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