wtf is going on at 2:12 ? NOT rolling shutter issue

[Johnny Smith]

okay, no problem 🙂
fyi in the future, right click on a vimeo video and click HD off and it’ll load much faster, just in case you didn’t know.

Thank you.

[Rafael Amador]

In the moment you move a camera with a CMOS, you get Rolling Shutter there.
If you step frame by frame in any clip with some camera movement, the RS would be very easily spotted.
But this RS is not an issue. We don’t see frame-by-frame, so our eyes integrates that RS.
The RS start to be an issue, when you can spot it on a single frame.
For that, you really need fast camera movement and and elements on the frame that help to make the RS noticeable.

i don’t see much an issue of RS on your picture than the issue of shooting 24. 25 or 30P a dancing scene.
You don’t get that when you records 50 or 60 fps, whatever Progressive or Interlaced.
Pictures of a ballet won’t ever look fluid enough at such a frame rate (have a look to the Wiseman’s “La Danse” shoot in 35mm).

[Johnny Smith] “Or do I need a faster lens/more light so i could up the shutter? “
Rising shutter speed, the RS will be reduced, but this will kill the Movement Blur, making your picture more choppy. However this choppiness can be very well fixed adding some Movement Blur in Post.

If you want to rise the Shutter Speed but you are short of light, there are few techniques that will helps you.
A DSLR will give you more options than a video camera to achieve that:
https://library.creativecow.net/harrington_richard/DSLR-Low-Light-Shooting/1
https://library.creativecow.net/harrington_richard/DSLR-Pushing-ISO/1
rafael

http://www.nagavideo.com

[Martin Curtis]

I watched it in the browser. I watched it in QuickTime at full size, full speed. I watched it in QT at full size frame by frame. I couldn’t see anything technically untoward (apart from the general DSLR issues others have commented on) and especially nothing around 2:12.

As for the content, fine by me. Nothing better than watching pretty girls doing, well, what ever they want to.

[Johnny Smith]

thanks Rafael, as you probably know mark ii can only shoot up to 30fps. I probably should have bought a 7d instead. I guess I bought into the full sensor hype but your post makes sense, I have to agree.

And thanks, Martin, maybe it’s all in my head after all, but Rafael’s answer makes the most sense. Actually on the second thought, IT DOESN’T. 35mm is only 24 fps, and 35mm looks gorgeous and very fluid. So 30fps should be plenty to trick a human eye regardless of the speed of the dancing in front of the lens. I’m starting to think it’s the medium format photography lens that’s causing this. Maybe i should rent a cine lens and test it out.

[Rafael Amador]

Hi Johny,
Our eyes are long trained for p24 but when now why have have the change to see the same pictures recorded at higher frame rate is clear that this is the way to go.
I have few friends working on dance and theater video and all are mad about shooting 1080p50/60.
When they can’t acquire that, they go 720p50/60 or even 1080i50/60.
They don’t want to know nothing about p24/25 or30 anymore.
Cheers,
rafael

http://www.nagavideo.com

[Jeremy Garchow]

A cine lens is not going to fix the artifacts this camera can create.

All CMOS to some degree has this problem. Some handle it better than others an some are way more expensive than others.

I don’t know what more you could expect from a cheap still camera.

[Rob Grauert]

“Rising shutter speed, the RS will be reduced”

That’s not correct. To reduce the effects of the CMOS sensors, you have to increase the frame rate.

Increasing the frame rate forces the CMOS sensor to scan from top to bottom faster, and therefore reduces the jello effect, skew, etc.

So he’s stuck with what his camera can do since, as he already pointed out, it only shoots 30p

Rob Grauert, Jr.
http://www.robgrauert.com
command-r.tumblr.com

[Rafael Amador]

[Rob Grauert] “”Rising shutter speed, the RS will be reduced”

That’s not correct. To reduce the effects of the CMOS sensors, you have to increase the frame rate.”

You are absolutely right Rob.
Rising the Shutter Speed, the “cells” are open less time, but the time to scan the frame doesn’t changes.
The RS, will be the same.
Rising the fps, the scanning time is reduced and so will be the RS.
rafael

http://www.nagavideo.com

[Sohrab Sandhu]

[Mark Raudonis] “Rolling shutter? Puhleeze! I didn’t even get that far.”

Could’nt agree more. I mean whats the big deal at 2:12. As it is, all the footage is bumpy!

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FCS 3, AJA Kona Lhi

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