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#1 |
Regular Crew
Join Date: Jan 2015
Location: Tepetlaoxtoc MX
Posts: 37
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Problem solved: Motion blur
I was surprised by how much the figure of a person blurs as they walk across from left to right in front of the camera at a shutter speed of 1/60th second, so I double checked manual focus, bumped shutter speed up from recording 30p at 1/60 to 1/250, tried switching from 4K to HD and from 30fps to 60fps but the blurring of the moving figure was still a problem...
Several hours later I realized the problem was indeed shutter speed: clips filmed at 1/250th had less motion blur than 1/60 but were still not fast enough. This also surprised me as the person moving across the frame about 5 meters in front of the camera was walking at a normal walking pace and I had thought 1/250th would be more than enough. It wasnīt. Trying again I found that I had to push the shutter speed up to a minimum of 1/800 second to get what I considered to be acceptable/pleasing blur (sufficiently sharp to be able to see details yet still enough blur to convey the feeling of motion. Even pushing the shutter speed up to max 1/2500 sec didnīt completely freeze the movement of the walkerīs head. Last edited by Peter Lowe; May 22nd, 2017 at 07:16 AM. |
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#2 |
Inner Circle
Join Date: Feb 2006
Location: Belfast, UK
Posts: 6,149
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Re: Motion blurrr
Motion blur is essential for smooth looking motion in film and video. Removing it completely will produce a jerky look, some films like "Saving Private Ryan"use a higher shutter speed to intensify the explosions etc., however, it's about 1/250 at the most.
For normal work at 30fps, 1/60 is regarded as giving a natural look. |
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#3 | |
Major Player
Join Date: May 2005
Location: Eugene Oregon
Posts: 393
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Re: Problem solved: Motion blur
Quote:
In regards to motion still not looking totally sharp even at very high shutter speeds, I suspect this is likely more of an issue of the codec you are using, and not your frame rate. A common way codecs compress a moving image is to take advantage of motion blur, compressing those areas with motion more than areas that are not changing. As a result, the blurring you are seeing at 1/2500 shutter speed may very well be introduced by your codec, not a result of the shutter speed not being fast enough. |
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