This may be a dumb question. But how come when using the built in flash my sync speed is limited to 1/320, but with a sb-600 i have no limit on the shutter speed?
As i understand it sync speed is limited by the movement of the shutter planes across the sensor. At higher shutter speeds only a fraction of the sensor is exposed at the instant of flash and thus you would get a band of light over the area exposed when the flash fired.
Since this is a property of the camera body why would putting a different light change this?
As i understand it sync speed is limited by the movement of the shutter planes across the sensor. At higher shutter speeds only a fraction of the sensor is exposed at the instant of flash and thus you would get a band of light over the area exposed when the flash fired.
Since this is a property of the camera body why would putting a different light change this?
This may be a dumb question. But how come when using the built in flash my sync speed is limited to 1/320, but with a sb-600 i have no limit on the shutter speed?
Some flash power is lost to achieve this "limitless" syncing. At shutter speeds higher than 1/320, the second curtain starts to close before the first curtain is fully opened. Therefore, only a slit of the sensor is exposed at any time instance. SB-600 gives out many short pulses to make sure that everywhere on the sensor is equally lit, instead of a single strong pulse when shutter speed is below 1/320. The built-in flash simply doesn't have enough power to lose to perform a focal plane flash (FP-flash).
Some flash power is lost to achieve this "limitless" syncing. At shutter speeds higher than 1/320, the second curtain starts to close before the first curtain is fully opened. Therefore, only a slit of the sensor is exposed at any time instance. SB-600 gives out many short pulses to make sure that everywhere on the sensor is equally lit, instead of a single strong pulse when shutter speed is below 1/320. The built-in flash simply doesn't have enough power to lose to perform a focal plane flash (FP-flash).