Our Camera is made up of two curtains. They are names as First Curtain (upper) and Second Curtain(lower). These curtains are always closed. Unless the curtains in out houses, camera curtains move vertically. When you press the 'shutter release' it tells the camera to open the shutter. Then the first curtain opens to reveal the light to the camera sensor. Then the second curtain follow behind to hide the light. Then the first curtain reset ans wait for you to release the shutter release again. In slower shutter speeds like 1/200 and below, only the second curtain will wait for the first curtain to open completely.
Sync Speed:
Sync speed is the faster shutter speed, of a camera that allows the first curtain to fully open before the second curtain begins to follow. In another words it is the fastest shutter speed you can use with the studio settings.
Consider if you want to click a photo on studio in which the model is jumping. In this case you should use a faster shutter speed in normal case. But if you use a shutter speed faster that sync speed, there will be a black line in the resulting photo. What you can do on this situation?
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