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You can always emulate a GND from a "properly" (no highlights blown out) photograph in the computer; problem is that raising the shadows produces too much noise. But now that you can have files with a massive dynamic range, it is probably worthy trying again. At the end of the day, the results are going to be roughly the same, and much more versatile.

I will definitely will try to shoot a sunset landscape in dual ISO. Expose for the sky in ISO 100 and bring up the shadows in post.

That would be amazing!

On another note, I am tossing up between the 5D2 and 5D3 at the moment. Will the Dual ISO ever come to the 5D2?

Unfortunately only the 5D3 and 7D have the hardver for it, it's impossible on other models. Go for the 5D3! 

Hi a1ex,

Just an idea...
would it be possible or practical to emulate a graduated ND filter in a new dual ISO mode? Let's say the top 1/3 of the image is in ISO 100, the bottom 2/3 is in ISO 800/1600, etc. You could move up and down the transition line with the joystick and the transition could be hard or soft (variable). You could emulate even a reverse ND for sunset shooting.
This would be a great advantage for landscape photographers who use filters to reach the proper results. And in this case we wouldn't have to deal with resolution loss and aliasing, etc. Only the transition area could be more problematic by using alternating lines of ISOs as today. So basically we would narrow down the usage of the current dual ISO mode with alternating lines to a small horizontal segment of the image, while the other parts of the image would be in 2 different ISOs.
I am curious about your thoughts on this.

Great work, anyway!

Hello, I created a Vimeo group for 5D MK III videos on Vimeo. Please, feel free to join the group or browse through 137 videos:

https://vimeo.com/groups/192344

I created a 5D MK III raw video group on Vimeo. There are already 120 videos in the list and always updating. Please feel free to join:

https://vimeo.com/groups/192344

Hello, I created a "5D MKIII raw" video group on Vimeo and already collected 97 videos. I also try to regularly update it with the best and newest videos. Please feel free to join:

https://vimeo.com/groups/192344

I am thinking, whether it is possible with the 5D MK III using both a CF and SD card at the same time to record every third or fourth frame only on the SD card? The filenames would be the same, thus uncompressing could easily go to the same folder. This way we could reach a 120-130 MB write speed with the fastest cards at the moment (80-90MB/s CF + 40 MB/sec SD).

Anyway, kudos to the Magic Lantern Team!