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<blockquote data-quote="Bob Blaylock" data-source="post: 405223" data-attributes="member: 16749">You can't.&nbsp; It is a characteristic of <a href="https://en.wikipedia.org/wiki/Focal-plane_shutter" target="_blank">focal-plane shutters</a> that at higher speeds, the entire frame is not all exposed at the same time.&nbsp; Electronic flash units have a very short flash duration, so if one were to fire during an exposure by a camera using a focal plane shutter at a high speed, only the portion of the frame that was exposed when the flash went off would be illuminated by the flash.&nbsp; It's pretty much a standard limitation on all cameras that use focal plane shutters (which includes nearly all SLR-type cameras) that you can only use electronic flash with it up to a certain shutter speed.&nbsp; On your D3300, that top shutter speed is 1/200 of a second.&nbsp; On older, mechanical film cameras, that limit is usually much lower.&nbsp; On my F2, built in 1972, it's only 1/80 of a second.&nbsp; On the other hand, because the duration of an electronic flash is so short (usually, I think, around 1/500 to 1/2000 of a second), if such a flash is the primary source of illumination for a picture, the effect will end up being about the same as if you were able to use a very fast shutter speed.</blockquote>

[QUOTE="Bob Blaylock, post: 405223, member: 16749"] You can't. It is a characteristic of [URL="https://en.wikipedia.org/wiki/Focal-plane_shutter"]focal-plane shutters[/URL] that at higher speeds, the entire frame is not all exposed at the same time. Electronic flash units have a very short flash duration, so if one were to fire during an exposure by a camera using a focal plane shutter at a high speed, only the portion of the frame that was exposed when the flash went off would be illuminated by the flash. It's pretty much a standard limitation on all cameras that use focal plane shutters (which includes nearly all SLR-type cameras) that you can only use electronic flash with it up to a certain shutter speed. On your D3300, that top shutter speed is 1/200 of a second. On older, mechanical film cameras, that limit is usually much lower. On my F2, built in 1972, it's only 1/80 of a second. On the other hand, because the duration of an electronic flash is so short (usually, I think, around 1/500 to 1/2000 of a second), if such a flash is the primary source of illumination for a picture, the effect will end up being about the same as if you were able to use a very fast shutter speed. [/QUOTE]

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