What's so important about sync speed?
- What is sync speed: http://betterfamilyphotos.blogspot.com/2010/07/why-is-sync-speed-optimal-for-flash.html
- Bounce flash at sync speed: http://betterfamilyphotos.blogspot.com/2010/11/most-efficient-setting-for-bounce-flash.html
- High speed sync has a 2-stop power loss compared to non-HSS: http://betterfamilyphotos.blogspot.com/2010/05/improving-flash-efficiency-with-nd.html
Here's Neil van Niekerk's explanation of the issue:
Put another way, at 200 ISO, your flash has 1 stop more range or can shoot at a 1-stop narrower aperture relative to 100 ISO, so that even though you may need to shoot at a narrower aperture at 200 ISO (as opposed to 100 ISO), the relative power of your flash (compared to ambient) won't diminish.
If you're looking for a camera with a very high sync speed, the ones I'm aware of with 1/500 sync speed are:
- Nikon D70 - has a built-in flash commander for one group.
- Nikon D70s - has a larger 2-inch LCD screen than the D70.
- Nikon D50 - sensor has less noise than the D70 or D70S, but is an entry-level Nikon with no rear dial, no commander mode, and no built-in focus motor.
- Nikon D40 - also an entry-level Nikon; has an even better (lower noise) sensor than that of the D50.
Nikon D300, D300S, D7000, D700
Note: I don't know how this higher sync speed works nor do I know what the power loss is.