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p.2 #10 · Canon EOS 5D. New camera. Pics. | |
cineski wrote:
A 1/200th flash sync ? What?!? Why is it Nikon can go to 1/500th on certain models (including the upcoming D200)?
It's the same reason that the 1D can do 1/500 and the Mark II can't. CMOS sensors cannot be switched on and off and thus require a mechanical shutter to control the exposure. Thus, the sync speed is limited by the fastest speed that the shutter curtains can travel.
On CCD cameras, like the 1D and most Nikons (D1*, D70, but NOT the D2H), the exposure is controlled via electronic CCD timing, although a mechanical shutter is still retained for protection and bulb mode. Thus, even at fast shutter speeds, the whole frame is exposed at once, allowing a much higher sync. (If you use the PC port I'm told you can sync a 1D right up to 1/8000, but of course the flash duration is usually longer than that.)
Alex53 wrote:
with an external flash you can shoot faster than the flash sync (albeit at the expense of some power),and this camera has no built in flash
External flash has absolutely nothing to do with max sync speed. You're thinking of high-speed sync, or as Canon calls it focal-plane flash mode, which pulses the flash many times a second for a longer duration in order to ensure that the whole frame is covered by the flash exposure as the shutter curtains move.
Edited by Shivatron on Aug 09, 2005 at 11:17 AM GMT
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