July 31, 2014, 06:55:39 PM

Author Topic: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops  (Read 29647 times)

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From Magic Lantern

The Magic Lantern team is letting the world know that they are at the beginning of a new function for the 5D Mark III and EOS 7D. Apparently they’ve figured out a way to boost dynamic range by 3 stops by using a new way of making a photograph by using ISO 100 for some of the vertical lines and ISO 1600 for the rest of it. Sounds wild to us, not sure how they’re doing that. There will be a process to combining the lines of 100/1600 ISO to give you the full resolution file.


From Alex at ML



  • Works for both photos and raw videos on Canon EOS 5D Mark III. On Canon EOS 7D, photo only (since it can’t do raw video).

  • What are the benefits? more dynamic range (less shadow noise).

  • The functionality was not really in Canon firmware, but in the chip that samples the sensor. Canon firmware does not make any use of it (they just set both ISO “registers” to the same value). It was implemented on the hardware side though (and that’s why it works only on these 2 cameras, because only they have two ISO amplifiers).


Read more at Planet5D | Visit Magic Lantern


 


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Daniel Flather

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #1 on: July 16, 2013, 05:49:51 PM »
Interesting.
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peederj

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #2 on: July 16, 2013, 05:53:22 PM »
Well now that we are aware of this technique, we should examine the DR claims of other video manufacturers to see if this is how they're doing it. The tell-tale would be aliasing effects on high-contrast diagonals.

Which shows you how important chart tests are, and how bizarre it is that there still isn't a site that does consistent and reproducible chart tests for the entire range of video cameras. At the cost of these things, we have a right to know.

AAPhotog

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #3 on: July 16, 2013, 06:23:07 PM »
Well now that we are aware of this technique, we should examine the DR claims of other video manufacturers to see if this is how they're doing it. The tell-tale would be aliasing effects on high-contrast diagonals.

Which shows you how important chart tests are, and how bizarre it is that there still isn't a site that does consistent and reproducible chart tests for the entire range of video cameras. At the cost of these things, we have a right to know.
You do have a right to know. Set up the websites and conduct the tests!
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GDub

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #4 on: July 16, 2013, 06:38:01 PM »
Cool! AMAZING, actually. I've been using ML on my T2i for a while now and IT IS THE BOMB! I've been waiting for the first official "stable" release to install it on my 5DM3, but this feature will get me to load an alpha release when it's ported. I'm also looking forward to what they're fiddling with on the EOS M!
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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #5 on: July 16, 2013, 06:47:59 PM »
I'm looking forward to experimenting with the new technique in a day or two.  I'm curious about how bad the aliasing will be in the highlights and shadows as a result of this method.  I figure that if other manufactures were doing this, we would be able to spot it by looking at the highlights and shadows.

Edit:  Turns out the Alexa does something similar.
« Last Edit: July 16, 2013, 06:55:00 PM by crazyrunner33 »

tron

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #6 on: July 16, 2013, 08:03:29 PM »
Until a fully featured ML version is compiled and distributed for 5D3 (with 1.2.1 firmware) it is purely theoretical...


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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #6 on: July 16, 2013, 08:03:29 PM »

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #7 on: July 16, 2013, 08:05:39 PM »
Seriously.... why doesn't Canon Hire Alex and his team....  Way back when I was done with a 350d and kit lens, I was not system dependant... I could have gone Nikon or Canon... ML brought me to the Canon camp. How many 5D2 users have stayed with Canon due to ML... it's amazing how ML has helped Canon.
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RGF

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #8 on: July 16, 2013, 08:07:47 PM »
Very interesting but would like to understand what 14 stops mean.

In the lowest (darkest) stop, how much data is there?  8 bits or 256 gray levels, 4 bits or 16 gray levels, ...?

AAPhotog

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #9 on: July 16, 2013, 08:10:48 PM »
Very interesting but would like to understand what 14 stops mean.

In the lowest (darkest) stop, how much data is there?  8 bits or 256 gray levels, 4 bits or 16 gray levels, ...?
If it were bright enough out side that you had a choice of either under exposing 2 stops and seeing in the shadows and having the sky blown out, or exposing for the sky and the shadows were pitch black, but the difference was 2 stops(ie exposing at 400 iso would show the sky but no shadows/1600 would show the shadows but blown out sky), this hack would enable you to keep the detail in BOTH the shadows AND the sky at the same time
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AAPhotog

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #10 on: July 16, 2013, 08:13:27 PM »
Until a fully featured ML version is compiled and distributed for 5D3 (with 1.2.1 firmware) it is purely theoretical...
So you mean to tell me that this isn't practical without being able to use it with 1.2.1 firmware?
Well I must say as a 1.1.3 user, I appreciate and make use of their hard work on a day to day basis. So I could care less about being able to record through hdmi a horrible 1080 picture on another $800 device that is sold seperately.
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michi

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #11 on: July 16, 2013, 08:21:46 PM »
Wow, talk about keeping that 7D alive!

gmrza

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #12 on: July 16, 2013, 08:24:43 PM »
Seriously.... why doesn't Canon Hire Alex and his team....  Way back when I was done with a 350d and kit lens, I was not system dependant... I could have gone Nikon or Canon... ML brought me to the Canon camp. How many 5D2 users have stayed with Canon due to ML... it's amazing how ML has helped Canon.

I suspect there may be more to this than immediately meets the eye, however, there is interesting possibility here for Canon to get a lot more mileage out of existing hardware.

There are however marketing issues - if this really works, we would probably see the 5DIII get more DR than a 1Dx.  As for 7D users - if it works, it will be a good motivator for me not to look at a 7DII (not that I would, as having a 5DII and 5DIII mostly negates the need).  For those with 7Ds, this may be the best investment protection yet. - Again, the proof of the pudding .....
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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #12 on: July 16, 2013, 08:24:43 PM »

CharlieB

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #13 on: July 16, 2013, 09:21:33 PM »
Now thats a swift kick in the pants for 'ol Canon....

I'm sure FakeChuckWestfall will be amused.....

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #14 on: July 16, 2013, 09:31:45 PM »
I had never even considered installing ML on any of my cameras .... Until now! This would be so flippin awesome for the 7D! Haha in your face all those who said it was dead! I knew it had one last trick up it's silicon sleeve! (Now I just hope it works!)

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Re: Magic Lantern Improves 5D Mark III Dynamic Range to 14 Stops
« Reply #14 on: July 16, 2013, 09:31:45 PM »