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<blockquote data-quote="WayneF" data-source="post: 291357" data-attributes="member: 12496">Right, flash sync has changed meanings today too.&nbsp; Before electronic flash (when we used flash bulbs - up into the 1970s), all cameras (with adjustable settings) had such flash sync switches on them, depending on which flash bulbs we bought.&nbsp; M was medium, F was fast, for how long it took the flash bulb to fully ignite to full brightness.&nbsp; The bulbs had to be triggered that much early, before the shutter opened, to become bright.&nbsp;&nbsp; My memory is medium was 25 milliseconds, fast was 15 ms.&nbsp;&nbsp; And FP flash bulbs which burned longer for focal plane shutters, the equivalent of todays HSS or FP flash mode.&nbsp; Then came electronic flash, which was real fast, zero delay, and it was called X sync on this same switch (I always heard that X was for xenon flash tubes used in electronic flash).&nbsp; &nbsp; Our modern Nikons still say they do X sync, meaning for electronic flash.So everything is X sync today, and flashbulbs and the switch went away.But today, more good stuff uses the focal plane shutter, and sync has become a maximum shutter speed issue - speeds at which the shutter is fully open to pass the flash.</blockquote>

[QUOTE="WayneF, post: 291357, member: 12496"] Right, flash sync has changed meanings today too. Before electronic flash (when we used flash bulbs - up into the 1970s), all cameras (with adjustable settings) had such flash sync switches on them, depending on which flash bulbs we bought. M was medium, F was fast, for how long it took the flash bulb to fully ignite to full brightness. The bulbs had to be triggered that much early, before the shutter opened, to become bright. My memory is medium was 25 milliseconds, fast was 15 ms. And FP flash bulbs which burned longer for focal plane shutters, the equivalent of todays HSS or FP flash mode. Then came electronic flash, which was real fast, zero delay, and it was called X sync on this same switch (I always heard that X was for xenon flash tubes used in electronic flash). Our modern Nikons still say they do X sync, meaning for electronic flash. So everything is X sync today, and flashbulbs and the switch went away. But today, more good stuff uses the focal plane shutter, and sync has become a maximum shutter speed issue - speeds at which the shutter is fully open to pass the flash. [/QUOTE]

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