Fri Jan 30, 2009 3:00 am
Slow Sync would help to balance flash with dim indoor illumination, but it will have no effect outdoors in daylight. All Slow Sync does is to remove the 1/60 second minimum shutter speed (menu #21) when flash is used with camera A or P mode. This would allow slower shutter speeds to bring up the ambient light indoors in a dim room. But outside in daylight, the shutter speed is already faster than this minimum menu.
In daytime outdoor light, you want to start with camera P mode. We must expose the daylight properly, and P mode should do that. A or S modes could do it too.
Is this the camera popup flash, or an external speedlight? The D70 popup is in its iTTL Balanced fill flash mode automatically, in P, S, or A modes, so long as you don't select Spot Metering. Spot metering cannot be balanced. With an external flash, outdoors set it to TTL BL mode (indoors, always set it to TTL mode).
First test with a shot with flash door shut or the flash power turned off. You get some result.. If the daylight ambient is too bright or too dark, adjust it with Exposure compensation (outside button by shutter button), to get a proper daylight exposure, like you want it.
Then turn on the flash, and test that. If the flash is too bright, lower it with Flash compensation (see manual, this is the flash door button on D70, its scale is in the top LCD). Often about -1 EV compensation is about right for fill flash. Set it for the result that you want. Next time will be very much easier, and following time will be automatic. Or you can practice this in your back yard tomorrow.
Don't forget you have changed compensations, restore them to zero when done.