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We can even edit it at any rate these days due to modern editing software applying the pulldown needed to interpolate the footage at the correct display rate. We can film at any rate we choose on modern cameras and play it back at any rate we choose. So, why does all of this matter in the digital age? This would be the native normal shutter speed for PAL and NTSC countries. At 25fps we would then need to close the shutter 50 times a second.

This reduces the light hitting the sensor and introduces blur.

To get a natural motion effect we need to close the shutter twice as fast as the sensor takes an image. Therefore bringing us back to those 50hz and 60hz numbers again. The most natural motion blur we are used to is the one we see on television or in films. So, to get motion that we perceive as natural in the real world we need to change the shutter speed depending on the framerate we are using. Varying Shutter Speeds Effect on Motion Blur However, closing the shutter every frame creates a moving image that seems, somewhat, unnatural. To capture an image on the sensor of a camera the internal shutter needs to close for the image to be captured. The shutter speed now becomes a factor to enable the вЂnatural motion blurвЂ™ we are accustomed to. When NTSC colour was introduced in 1953, the older rate of 60 fields per second was reduced by a factor of 1000/1001 to avoid interference between the chroma subcarrier and the broadcast sound carrier. However we actually should call 30fps 29.97fps due to the advent of colour television and an artefact in the display of 60fps in NTSC countries. 30fps is derived from the 60hz signal used in these countries, displaying 60fps interlaced imagery. 30fps (29.97fps)ДЈ0fps is therefore the normal frame rate of all non-PAL countries, otherwise known as NTSC (Canada, US, Japan, South Korea).

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25fps therefore is still the standard video frame rate for PAL countries as it is a progressive framerate and is perfectly compatible with modern and old analog TV sets alike.

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