April 20, 2018 at 4:59AM

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SONY Nex-VG900 bad image quality

I have a problem with my new Nex-vg900.

I have had the predecessors of this camera and have loved working with them. So I was excited to get a chance to wirk with the 900. And basically it's great, but I have a problem with the image quality that I can't seem to solve no matter what combination of settings and lens I try.

Non-horizontal lines are fringed with artifacts that look like there's digital zooming going on (which there isn't). It seems only to occur when I work in the APS-C cropeed mode wether I use a full-frame lens or an APS-C lens.

Here is a screenshot.
https://www.dropbox.com/s/mh9um61p7wphqns/nex-vg900.jpg?dl=0
Has anybody else encountered this problem?
There are some youtube-videos exhibiting the same poor quality but others seem to be as crisp as possible even when filmes on smaller lenses.

I'm at a loss. I would love to love and use this camera, but the quality I get out of it (understandably, I think) just won't cut it for me.

Any ideas?

7 Comments

What was the settings when that shot was taken? Specifically frame rate, and codec?

April 20, 2018 at 5:45PM

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Matthias Claflin
Videographer
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I tried everything, I could think of:
24p, 25p, 50i and 50p. The codec seems to be h246 in an AVCHD-container. There seems to be no other option with this camera.
Also I tried different bitrates.

But I don't think any of these is the culprid since I got good results in full-frame-mode using the exact same settings as before.

Thanks for your answer.

April 24, 2018 at 8:22AM

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The reason I asked is because it looks like an interlacing or aliasing issue. I would guess it relates to how the processor downscales the image. It's a 24 megapixel sensor. HD video only uses about 2 megapixels. Is there any footage from this camera (from someone else) you can point to that doesn't have this issue?

April 26, 2018 at 5:50PM, Edited April 26, 5:52PM

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Matthias Claflin
Videographer
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Here's a youtube video that has shots with these sypmtoms (the railway shot is particularily bad) and some that look clean...
https://www.youtube.com/watch?v=WYypHQC1WEk

Sony's promo however looks crisp every frame...

Weird.

Mirko Schieder

April 30, 2018 at 4:04AM

Sorry. Forgot the link to Sony promo video:
https://www.youtube.com/watch?v=XKQwls52YXo

Mirko Schieder

April 30, 2018 at 4:05AM

Here are two shots with the exact same settings, same lens etc.
0005.mts in full frame mode, 0006.mts in APS-C.
The latter displays the weird lines, the former seems to be much clearer.

https://www.dropbox.com/s/uvufsa5fbz5q0uj/nex-vg900.zip?dl=0

April 27, 2018 at 3:50AM

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I'm inclined to think this semms to be a common problem with the camera...
Here's a comparison video betwenn the VG900 and the Alpha7s.
https://www.youtube.com/watch?v=3_PPSIlKUJE&t=218s
@2:30 there's a split-screen that looks especially ugly.

I'm in touch with Sony.
Let's see, what I can find out.

Mirko Schieder

May 4, 2018 at 5:48AM

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