If you ever wondered how a shutter works you need to see this video. There are just some terms you might need to understand before you watch it
Rolling shutter is a method of image capture in which a still picture is captured by scanning across the scene rapidly, either vertically or horizontally. Active Pixel Sensors read all of their pixels linearly from top left to bottom right while the shutter is open
Global shutter is a method of image capture in which a still picture is captured by taking a snapshot of the entire scene at single instant in time. These are typically found in camera’s with CCD Sensors. CCD Sensors (Charge Coupled Device) store their charge until it has been depleted
The Slo Mo Guys shows us just exactly what happens when you take a photo on a SLR.
Now as you watched this and if you use flash quite a lot, you might have had little light bulb moment. Typically your flash has two settings for Curtain sync. I prefer first curtain sync for subjects that is not moving and second curtain sync as the default setting when a subject is moving. On an APC sensor you will get a more natural image with second curtain sync given that the light from your flash moves quite a lot faster than that shutter and it fires off lower down given that you don’t hit some ridiculous shutter speed.
Something I have to highlight from the video is the case for Mirror Lockup. Noticed the vibration when that mirror opens and it finally comes to a halt? That is the blur in images when you work at low shutter speeds or low light when that vibration eventually makes its way through the camera body. It is also why you need not just any old cheapie tripod, but something rock solid! I have found mirror lockup reduces blur in images is with long exposures and especially in astrophotography
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