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However, since you are actually taking a photograph, it then has to restop the aperture, expose the sensor, then restore the camera back to its default settings again.That would reset the aperture to normal and close the shutter.
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When you take the shot, live view "exits", so the camera is set back to normal.In live view, it sounds like it stops the aperture down to where it should be.I would be willing to bet this is simply due to the camera changing modes back and forth between live view, actually exposing a photograph, and returning to live view. This doesn't explain why it opens and closes after the picture, though, since it stays at the new aperture. I have noticed that if I change the aperture setting during live view, the aperture doesn't change right away - when you take the picture, it opens all the way up, then closes down to the new aperture setting. The high dynamic range mode (Active D-lighting) is off, so it's not that.I've set white balance manually, so it's not white balance.I'm in manual exposure mode, so it's not metering.I'm in manual focus, so it's not autofocus.Why does the aperture need to move at all? Couldn't it simply stay stopped down?
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Use it to find the proper depth of field for your shots, but pay attention to your adjustments, including your ISO. If you don’t want to use autofocus to capture slow objects, like clouds moving in the sky, focus peaking is the technique for you. This can be useful for shoots with low-light conditions or when it’s difficult to determine a good focus with the naked eye. It’s ideal for scenarios where it’s challenging to quickly assess what areas are in focus. Focus peaking allows the photographer to focus manual lenses with greater speed than the typical Live View method.