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Originally Posted by Thomas Newton
Going by a .PDF chart at the Nikon site, it appears that the D50 also lacks support for what some people call "high-speed sync".
This is the ability to use the flash at greater than the normal "mechanical" sync speed (which I believe is 1/500th of a second on the D50 and D70s).
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FYI, the D70/D70s also do not offer "high-speed sync". Higher end Nikons offer that, but their normal sync speeds top out at 1/250s. From what I understand, this diff has mostly to do w/ the D50/D70/D70s using a CCD that offers electronic shutter that is used above the 1/250s point, which presumably reduces the mechanical requirements (and costs) of doing it all w/ the mechanical shutter.
Anyway, depending on your exact needs, it could be better to have the higher normal sync speeds of the D50/D70/D70s instead of the "high-speed sync" mode of the other Nikons (and also found on many other cameras). This is because "high-speed sync" mode is actually a trick feature that will substantially reduce the power/reach of the flash whereas the higher 1/500s max sync of the D50/D70/D70s do not reduce the power/reach of the flash. This diff could be quite meaningful for shooting fast moving subjects in a situation that requires flash (assuming 1/500s is fast enough). OTOH, the more commonly available "high-speed sync" mode would probably be more useul for general outdoor photography where you need some fill flash for a nearby subject in bright daylight situations.