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Canon EOS Full Frame for HD
All about using the Canon 1D X, 6D, 5D Mk. IV / Mk. III / Mk. II D-SLR for 4K and HD video recording.


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Old December 14th, 2008, 04:19 PM   #1
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SHUTTER CONTROL is what we need!!

Hi all, there are several ways to get aperture control of the 5Dm2... now we desperately need SHUTTER CONTROL!!!

Then we will have what we want :) - 1/60th, 1/125th = nice film-motion... hhmmmmmm!

Whenever my 5Dm2 uses anything below 1/60th shutter it looks like video ..... HELP!

Ive noticed when zooming in telephoto on the kit-lens the camera chooses nicer shutter speeds... But then it unlocks when you zoom out again...

The exposure compensation wheel helps sometimes but Canon have this incredible way of not allowing the "golden iso/shutter combo" no matter how hard I try and play and fiddle!!
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Old December 16th, 2008, 01:06 PM   #2
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Euh... film motion is 1/24 and not 1/60 or 1/125.

So it works the opposite as what you say.
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Old December 16th, 2008, 01:33 PM   #3
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Actually, it is a 180-degree 1/48th shutter speed (24 frames per second). At 30p, 180-degree is 1/60th.
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Old December 16th, 2008, 02:19 PM   #4
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I'm wondering is 1/60 is the correct target for a 30p camera. If you go with 1/50th (close to 1/48th), you get the same smear as with 24 fps 1/48th. And, yes, it will be smoother than 24 fps, if that's what you want for the shot.

The other interesting shutter is 1/80th. That speed has roughly the same "gap" as 24 fps 1/48, and has less smear. On the other hand, we have a higher frame rate so less smear might be the way to go. It would give us judder, but without the 3/2 cadence, which isn't natural anyway. Film was made to be projected at 24 fps (usually with two flashes per frame), not at 30 fps with an irregular cadence.

24fps 1/48
Open: 20.8 ms
Closed: 20.8 ms

30fps 1/80
Open: 12.5 ms
Closed: 20.8 ms

30fps 1/60
Open: 16.7 ms
Closed 16.7 ms

30fps 1/50
Open 20.0 ms
Closed: 13.3 ms

Now, if only we could reliably control it!
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Old December 16th, 2008, 05:57 PM   #5
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As 3/2 cadence, you are referring the 30p 1/50th shutter speed *2'' open 1.33'' closed* correct?

At first glance, I thought the same. I've changed my mind though. For 24 frames conversion, keeping the 180-degree seems the best option.
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Old December 16th, 2008, 06:22 PM   #6
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Mathieu,

In the US we use a 3:2 cadence to show 24p on a 60i or 60p TV. The television shows film frame #1 twice, #2 three times, #3 twice, #4 three times, etc. So, not only do we get the 24 fps judder due to the slow motion, but we get a strange syncopation effect.

There are 2,3,2,3 cadences and 2,3,3,2 cadences and other sub-variations possible when dealing with 24p to 60i.

I'm thinking that rather than this bizarre 24 to 60 cadence, a 30p with the right shutter speed might still give us the dreamlike feel without the one-short-leg-one-long-leg problem that 24p presents.

In Europe, this doesn't apply. Stick with 24p and speed it up by 4% and double the frames for your 50 Hz TVs. I still don't get why Canon didn't support the European market with 25p.
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