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max flash sync speed
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<blockquote data-quote="yauman" data-source="post: 383451" data-attributes="member: 15418"><p>It is about how fast the flash is - and the speed of the flash is related to the power output. It is not about how fast the shutter is or what the sync speed is - when you are using only the flash to light up a subject, all it matters is the the shutter is opened (doesn't matter how long) when the flash fires.</p><p></p><p>I don't know if you've seen images of the milk drop or the bullet through an apple done by Prof Edgerton of MIT - I took a class from him; that's how old I am!! The way it's done (remember those were the old days of slow electronics) is the camera is set at speed B - ie shutter locked opened, then when the bullet contacts the apple the flash goes off - that duration of the flash is the exposure time. (The whole thing is done in a pitch dark lab!)</p><p></p><p>So, back to modern flash and camera - the shutter speed is irrelevant, only that it's opened when the flash fires. The max sync speed is the fastest shutter the camera can operate and still have the "envelop" of flash completely inside the time the shutter is opened - you can see that the slower the better. If you look at the specs of your flash, you'll see that the flash duration range from 1/1000 sec to 1/10,000 secs - that duration is your exposure time - not the shutter speed. But the duration time is controlled by the power output - thus, you control the duration time by the power level. (In laboratory strobes we used, the power remains constant and the duration time of the strobe can be adjusted!)</p><p></p><p>Now, of course, if you use the flash as fill in, than the exposure of the main subject within range of the speedlight will be affected by the power output (ie duration of flash) but the background exposure will be affected by the shutter speed. <a href="http://neilvn.com/tangents/flash-photography-techniques/dragging-the-shutter/" target="_blank">Look at the photos in this article</a> to get an appreciation of what the shutter speed will do to the background when you use your flash as a fill-in and how little effect it has on the main subject that it lights up. </p><p></p><p>Hope that helps.</p></blockquote><p></p>
[QUOTE="yauman, post: 383451, member: 15418"] It is about how fast the flash is - and the speed of the flash is related to the power output. It is not about how fast the shutter is or what the sync speed is - when you are using only the flash to light up a subject, all it matters is the the shutter is opened (doesn't matter how long) when the flash fires. I don't know if you've seen images of the milk drop or the bullet through an apple done by Prof Edgerton of MIT - I took a class from him; that's how old I am!! The way it's done (remember those were the old days of slow electronics) is the camera is set at speed B - ie shutter locked opened, then when the bullet contacts the apple the flash goes off - that duration of the flash is the exposure time. (The whole thing is done in a pitch dark lab!) So, back to modern flash and camera - the shutter speed is irrelevant, only that it's opened when the flash fires. The max sync speed is the fastest shutter the camera can operate and still have the "envelop" of flash completely inside the time the shutter is opened - you can see that the slower the better. If you look at the specs of your flash, you'll see that the flash duration range from 1/1000 sec to 1/10,000 secs - that duration is your exposure time - not the shutter speed. But the duration time is controlled by the power output - thus, you control the duration time by the power level. (In laboratory strobes we used, the power remains constant and the duration time of the strobe can be adjusted!) Now, of course, if you use the flash as fill in, than the exposure of the main subject within range of the speedlight will be affected by the power output (ie duration of flash) but the background exposure will be affected by the shutter speed. [URL="http://neilvn.com/tangents/flash-photography-techniques/dragging-the-shutter/"]Look at the photos in this article[/URL] to get an appreciation of what the shutter speed will do to the background when you use your flash as a fill-in and how little effect it has on the main subject that it lights up. Hope that helps. [/QUOTE]
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