1st Curtain Sync, 2nd Curtain Sync, and High Speed Sync
I know that you are thinking this all sounds quite strange. “What is a ‘curtain’ and what is ‘curtain sync’? And why do these terms have anything to do with my flashes and strobes?”
Let’s keep things simple. This information matters so that you can understand how your flash works. Your camera has two small mechanical curtains that open and close to expose the sensor to light. These curtains make up the camera’s shutter, and how quickly they open and close equates to your shutter speed. The curtains (or shutter) can expose the entire sensor to light all at once, or they can ...
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