Canon to Offer Global Shutter for 2.5k Video on an Upcoming DSLR? [CR1]

[JVLphoto]

<div name="googleone_share_1" style="position:relative;z-index:5;float: right; /*margin: 70px 0 0 0;*/ top:70px; right:120px; width:0;"><g:plusone size="tall" count="1" href=""></g:plusone></div><div style="float: right; margin:0 0 70px 70px;"><a href="https://twitter.com/share" class="twitter-share-button" data-count="vertical" data-url="">Tweet</a></div>
<p>We heard rumour that some folk in the video world are selling off gear in anticipation of a global shutter capable of 2.5k video being made available on an, as of yet, unnamed DSLR. While the wording is hearsay, A global shutter DSLR would definitely be an advancement in film-making tech.</p>
<p>Canon’s been pushing the threshold of video DSLR’s since the launch of the 5DMKII, so there’s no surprise that they would be working to incorporate even more “pro” level video tech in their cameras. It has been their push but, as this is from an unconfirmed source, be sure to sprinkle salt liberally with what you read.</p>
<p>[CR1]</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>

 

[TrabimanUK]

Not knowing what a "Global Shutter" is - what would the implications of this be if (hypothetically), it was launched on the (to be named) 7D update? Is there any benefit to the stills photography world or is it purely a video thing?

 

[friedrice1212]

Not knowing what a "Global Shutter" is - what would the implications of this be if (hypothetically), it was launched on the (to be named) 7D update? Is there any benefit to the stills photography world or is it purely a video thing?

It's a purely video thing. The global shutter is the opposite of the rolling shutter. In live view, the physical shutter doesn't move, so the sensor scans the scene 24 or 30 times a second to create frames.

With a rolling shutter, the sensor scans from top to bottom, creating a distortion effect if you pan the camera, because the sensor doesn't actually capture every part of the image at the exact same time.

A global shutter captures the entire image at once, then waits 1/24 of a second before doing it again, so the distortion, or the "rolling shutter effect" is not present. Global shutters are harder and more expensive to incorporate, as the camera has to process large amounts of data at once, in a small period of time.

For still photography using a physical shutter, it makes no difference.

 

[jointdoc]

Thank you friedrice1212. I was going to ask the same question.

 

[TrabimanUK]

friedrice1212, thanks. Useful explanation, and as I hadn't hoped for, it's a more of a video thing.

thanks,

Grant

 

[Quackator]

While global shutter is indeed very welcome in the video world,
it would at the same time eliminate x-sync in still photography
and overcome many of the problems that have led to the current
flood of HyperSync/SuperSync/overdrive flash triggers.

Regarding flash this would be a milestone, kill the need for HSS and Co.

I am anxiously looking forward to global shutters in still photography.

 

[docsmith]

Not knowing what a "Global Shutter" is - what would the implications of this be if (hypothetically), it was launched on the (to be named) 7D update? Is there any benefit to the stills photography world or is it purely a video thing?

It's a purely video thing. The global shutter is the opposite of the rolling shutter. In live view, the physical shutter doesn't move, so the sensor scans the scene 24 or 30 times a second to create frames.

With a rolling shutter, the sensor scans from top to bottom, creating a distortion effect if you pan the camera, because the sensor doesn't actually capture every part of the image at the exact same time.

A global shutter captures the entire image at once, then waits 1/24 of a second before doing it again, so the distortion, or the "rolling shutter effect" is not present. Global shutters are harder and more expensive to incorporate, as the camera has to process large amounts of data at once, in a small period of time.

For still photography using a physical shutter, it makes no difference.

Thanks for the explanation. However, I wonder if the physical infrastructure needed to perform a global shutter wouldn't have implications for still photography. A rolling shutter seems to be the necessary result of having slower processers/read rates (I could be wrong). To pull off a global shutter I would expect you would need faster or more A/D processors and faster read rates. I wonder if such hardware could benefit still photography in terms of fps and possibly (elephant in the room) noise.

 

[Lawliet]

Thanks for the explanation. However, I wonder if the physical infrastructure needed to perform a global shutter wouldn't have implications for still photography. A rolling shutter seems to be the necessary result of having slower processers/read rates (I could be wrong). To pull off a global shutter I would expect you would need faster or more A/D processors and faster read rates. I wonder if such hardware could benefit still photography in terms of fps and possibly (elephant in the room) noise.

Or you do it old school, with secondary buckets. Give each sensel the capability to put its current charge in a non photosensitve area. Then you have all the time you want to sample. Another option would involve a Kerr- or Pockels-effect based shutter.
But Canon wants more readouts anyway - DPPD-AF makes you want to potentially read the whole sensor*2 at the refresh rate of the current PDAF-sensors (and prcess that data).
Well, Sonys high end compact can read,process and compress to video 60 iirc 20MP-images per second, a similar core in a dual configuration could do quite a lot... 8)

 

[HurtinMinorKey]

It helps rolling shuttter in video:

http://www.youtube.com/watch?v=R-h46Zz9YZQ#t=15

In most cmos sensors, using global shutter means a loss in dynamic range. If they do this, hopefully it will be raw, but I doubt it.

I think this rumor is just pure speculation.

 

[roxics]

As someone who shoots a lot of video I would love this. But I wonder how it will affect the dynamic range of the sensor.

EDIT: HurtinMinorKey got to this question as I was posting.

 

[roxics]

I'm having a hard time believing this. It seems like Canon would introduce this on their C series of cinema cameras before their regular DSLR line. Same being true with the higher resolution (2.5K) video.

 

[littlebob]

Rolling shutter means you can never pan with your camera when shooting video. Ever. It sucks so bad I can't believe the DLSR video revolution ever happened

 

[mkabi]

I'm happy ;D
I'm not a DR guy, I light the sh!t out of my scenes

Rolling shutter means you can never pan with your camera when shooting video. Ever. It sucks so bad I can't believe the DLSR video revolution ever happened

How fast are your pans?

 

[mkabi]

I'm having a hard time believing this. It seems like Canon would introduce this on their C series of cinema cameras before their regular DSLR line. Same being true with the higher resolution (2.5K) video.

True. But they have 4K for their C line, why go down on resolution?

 

[KarstenReis]

Here is a good article from RED that explains it a bit better with some visuals.

http://www.red.com/learn/red-101/global-rolling-shutter

 

[HurtinMinorKey]

I'm having a hard time believing this. It seems like Canon would introduce this on their C series of cinema cameras before their regular DSLR line. Same being true with the higher resolution (2.5K) video.

Remember, the c300 uses an 8MP sensor and intelligently down-samples to 1080 in camera. So if we are only getting 2.5K reads off a sensor, then it's not like this "new camera" would necessarily be using as much or more image data.

 

[AvTvM]

don't care for video, don't need or want "global shutter" in a DSLR.

BUT ...
I absolutely do want a fully electonic (global) shutter without any moving mechanical parts (curtains) ... in a totally silent and absolutely vibration-free mirrorless cameras. "Solid State Camera" ... all the way!

 

[HurtinMinorKey]

don't care for video, don't need or want "global shutter" in a DSLR.

You still get rolling shutter artifacts (skew) when taking pictures of fast moving objects.

 

[roxics]

Remember, the c300 uses an 8K sensor and intelligently down-samples to 1080 in camera. So if we are only getting 2.5K reads off a sensor, then it's not like this "new camera" would necessarily be using as much or more image data.

Actually it's a 4K sensor downsampled in camera to 1080p. But the point remains that the final image is 1080p. Whereas this headline seems to indicate that the new camera will have a final 2.5K output image.
Granted the 1DC does do 4K output. But unless the rest of the C series gets a 4K update I can't foresee Canon giving a higher output resolution to their regular DSLR line first.

But I'm willing to admit I could be totally wrong. There is more to a good image than just resolution. The C series has more going on than just downsampling.

 

[9VIII]

don't care for video, don't need or want "global shutter" in a DSLR.

You still get rolling shutter artifacts (skew) when taking pictures of fast moving objects.

That was my understanding as well, that photographing something like a helicopter would give warped blades unless the camera had a global shutter.
I see this as being just as good for stills as video.

Hopefully this is talking about the 7D replacement, I would love to have 2560x1440 video capability.