Resolution / Aliasing / Comparison: Sony A7 vs. A7r vs. Canon 5D mark III

We’ve been testing the new mirrorless Sony alpha a7 and Sony alpha a7R cameras that come with very promising new features dedication to video. Here’s a quick and dirty resolution comparison of the video function between these two and our all time favourite the Canon 5D mark III.

a7a735d3_1When you watch the video you can clearly see the differences between the cameras.
Some initially thought the higher resolution of the a7R versus the a7 would increase the video quality. This is true, but the test reveals that this difference is ever so tiny that it can hardly be noticed. When compared to the 5D mark III on the other hand we can see that the aliasing and moiré of the a7 as well as the a7R is pretty severe, probably similar to that of Canon DSLR’s like the 7D or TxI line.

On the left you can see the rig I used to make an accurate rolling shutter comparison. This revealed that the rolling shutter on the 5D mark III is much stronger than on the a7’s.
Is this a good thing? Yes it is. But the rolling shutter seems to be something most people take less severe as an argument against a camera.

The settings on both a7’s were the “Neutral” picture profile with everything turned down to -3. The same goes for the 5D mark III which had the “Neutral” picture profile and contrast/saturation/sharpness all the way down to 0.

There was no grading applied except for the last shot.

What I found really great about the Sony a7 was its oled viewfinder. This thing is truly amazing. I wish more cameras had this kind of technology implemented, or the A7’s had a cleaner image. In terms of functionality it’s not a bad camera by Sony. For more info check out Johnnie Behiri’s review.

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AKentPhoto
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AKentPhoto

Any chance you could throw one of the A7s onto the Atomos? Would love to see the difference between the camera codec and the 4.2.2 coming out of the HDMI.

Thanks! Great stuff here!

Richard
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I second this, would love to see the hdmi video out

Sebastian Wöber
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Sebastian Wöber

We’re on it.

Brooke
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We are releasing a setup video for the A7 and RX10 shortly the we filmed at InterBEE.

They both look very promising, and work great with the Ninja and Blade.

Sadly we didn’t have them for long enough to take video samples of internal versus our ProRes recording.

Cheers,

-Brooke | atomos

Joel Richards
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Thanks for this quick comparison! The difference between the A7 and the A7r doesn’t seem to be that great. The 5D3 certainly have less moire and aliasing but it also seems softer and less detailed? If the rolling shutter test is any indicator the A7 has the fastest readout of all three sensors. It is disappointing that Sony did not do more the leverage the supposed speed of the Bionz X to tackle some of these issues. Can you do a rolling shutter test between the A7 and the RX10? If the Boinz X can handle reducing the whole 20MP… Read more »

James Villarcorta
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James Villarcorta

A long time user of the 5Dm3 (for video) and now a A7r owner (for stills). You are correct, the image in video is indeed softer but this is easily correctable in post with a bit of sharpening. Moire and aliasing however cant be corrected.

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[…] have also taken a look at the aliasing and moire of the Alpha7 and 7R in comparison to the Canon 5D mkIII. They note that both Sony cameras exhibit stronger aliasing […]

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