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<blockquote data-quote="Bob Blaylock" data-source="post: 538047" data-attributes="member: 16749">It is a characteristic of focal plane shutters, which are used in nearly all SLRs, that they can only work with short-duration flash up to a certain shutter speed.&nbsp; Beyond that speed, not all of the frame is exposed at the same time, and if a flash were to go off, it would only expose part of the frame.&nbsp; See <a href="https://en.wikipedia.org/wiki/Focal-plane_shutter" target="_blank">https://en.wikipedia.org/wiki/Focal-plane_shutter</a> for an explanation of how focal plane shutters work.&nbsp; Note the illustration that shows how, at high speed, the shutter basically takes the for of a narrow slit moving across the frame, and understand that an electronic flash going off during that time would only expose the part of the film that was uncovered at that instant by that narrow slit.&nbsp;&nbsp; Count yourself fortunate that your modern camera can do X-sync at up to 1/200 of a second.&nbsp; My 1972-vintage F2 can only do it up to 1/80″, and that is a bit faster than the 1/60″ that was typical of most SLRs of its day.</blockquote>

[QUOTE="Bob Blaylock, post: 538047, member: 16749"] It is a characteristic of focal plane shutters, which are used in nearly all SLRs, that they can only work with short-duration flash up to a certain shutter speed. Beyond that speed, not all of the frame is exposed at the same time, and if a flash were to go off, it would only expose part of the frame. See [url]https://en.wikipedia.org/wiki/Focal-plane_shutter[/url] for an explanation of how focal plane shutters work. Note the illustration that shows how, at high speed, the shutter basically takes the for of a narrow slit moving across the frame, and understand that an electronic flash going off during that time would only expose the part of the film that was uncovered at that instant by that narrow slit. Count yourself fortunate that your modern camera can do X-sync at up to 1/200 of a second. My 1972-vintage F2 can only do it up to 1/80″, and that is a bit faster than the 1/60″ that was typical of most SLRs of its day. [/QUOTE]

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