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Old 27th of February 2010 (Sat)   #1
Saw the Light
Join Date: Dec 2007
Location: Naperville, IL
Posts: 839
Default Shutter speed with video?

This confused me today while messing with my 7D - that you select the shutter speed... I'm like wait, the shutter isn't being used!

Can someone explain that to me?

Also, why are the video files so large? a 1 minute 1080p video was almost 350MB. Considering blu-ray discs are 25GB and contain 2+ hours of video, at that rate, only 75 minutes would fit on a blu-ray disc.
Gripped 7D, Tamron 17-50 F/2.8, 70-200L F/2.8, 300L F/4 IS, Canon 50 1.4, 2x YN-460 II, 430EX, Cybersync
Want list: 300mm F/2.8, Sigma 30 F/1.4.
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Old 27th of February 2010 (Sat)   #2
haknslash's Avatar
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Location: Crimson Tide state
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Default Re: Shutter speed with video?

Basically your sensor is turning off and on.

Yes the RAW file size is huge. However most people edit and the file size will drop. Especially if you transcode to a different format prior to post.
7D | 50 f/1.4 | 85 f/1.8 | 135 f/2 L | 430EX II

Last edited by haknslash : 27th of February 2010 (Sat) at 00:27.
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Old 27th of February 2010 (Sat)   #3
Join Date: May 2009
Location: Toronto, Canada
Posts: 949
Default Re: Shutter speed with video?

The shutter speed is controlling a electronic shutter. Basically how often the image is read off the sensor. And like stills you can "freeze" motion with faster shutter, sort of anyhow. Try say a fan and take videos of it at different shutter speeds with the 7D. You'll see what I mean. In general, you can keep it from 1/30 to 1/60 and things will be good. If you want to get momentary frozen images in your video then set higher shutters.

As for size. Well you are trying to compress a lot of data in real time. And while there's two digic 4s we don't know for sure they are being used for video. I believe in the 5D2 a separate encoder chip is used for video. Anyhow, it makes sense (from a power consumption point of view) that a lower compression ratio is a good. To achieve higher compression they would need a more powerful encoder which will most likely draw more power.

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