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Sony Alpha Mirrorless and DSLR
Sony Alpha a7s: Full HD Recording in XAVC and 4:2:2 UHD 4K Output via HDMI.


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Old April 7th, 2014, 04:35 PM   #31
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Re: New Sony A7s to shoot 4K video

If you hate bulk like me but want to be able to grade in post--and most importantly you aren't afflicted with my 4k fetish--then the a7s combined with the new tiny Ninja Blade is a helluva combo.
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Old April 7th, 2014, 07:06 PM   #32
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Re: New Sony A7s to shoot 4K video

I also share your 4k fetish, but fortunately my AX100 scratches that itch as I'm very happy with that video camera. I'll have to see what the options are by the time the A7s comes out, because I can't help but think that it's sensor will also appear in either a VG900 or FS-100 successor. I'm pot committed one way or the other as I just sold my VG900, so I will eventually need a full frame video camera replacement.
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Old April 7th, 2014, 10:58 PM   #33
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Re: New Sony A7s to shoot 4K video

Quote:
Originally Posted by Cliff Totten View Post
Wouldn't it have been more beneficial for Sony to have built a 14-16 megapixel sensor?
No.

The beauty of this is that it's a full sensor read out. Meaning no pixel/line skipping = no moire.

And less pixels means larger photons and that what gives it the light sensibility and dynamic range.
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Old April 8th, 2014, 12:58 AM   #34
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Re: New Sony A7s to shoot 4K video

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Originally Posted by Dmitri Zigany View Post
The beauty of this is that it's a full sensor read out. Meaning no pixel/line skipping = no moire.
It looks like it only does a full sensor readout in 24/30fps movie modes according to one of Sony's promo videos. I guess that means if you use 1080p 60fps then it still does line skipping.
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Old April 8th, 2014, 02:28 AM   #35
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Re: New Sony A7s to shoot 4K video

"It looks like it only does a full sensor readout in 24/30fps movie"

I also spotted that and found it quite odd. Frame rates should be independent of sensor readout. Can somebody with better knowledge of the subject give some insight?
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Old April 8th, 2014, 03:12 AM   #36
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Re: New Sony A7s to shoot 4K video

There is one more question that needs to be answered:
If it does 4K from direct sensor readout, without line skipping or pixel binding, how it achieves the
HD1080 image?
Does it throw out pixels with skipping/binding?
Reads directly from a smaller part of the sensor which means that the HD1080 is further cropped from FF?
Downrez the 4K image in the processor retaining the same crop factor?
Something else?

So far the only thing that I found is that when shooting 720p it reads an APS-C area of the sensor.
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Old April 8th, 2014, 05:48 PM   #37
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Re: New Sony A7s to shoot 4K video

Quote:
Originally Posted by Emmanuel Plakiotis View Post
"It looks like it only does a full sensor readout in 24/30fps movie"

I also spotted that and found it quite odd. Frame rates should be independent of sensor readout. Can somebody with better knowledge of the subject give some insight?
I remember when the Sony NEX-FS700 came out and Philip Bloom was testing the high frame rate/slow-motion shooting modes. Particularly at the highest two frame rates the image noticeably degraded. So sensor read-out and frame rate should be independent in an ideal theoretical world, but in the real practical world, not so much.
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Old April 8th, 2014, 08:25 PM   #38
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Re: New Sony A7s to shoot 4K video

I wonder if the sensor finds its way into an a99 sized camera if that would allow it just enough room to dissipate the heat for internal 4k recording--and if it would have the superior AF of the a6000?
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Old April 10th, 2014, 05:41 PM   #39
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Re: New Sony A7s to shoot 4K video

102000 iso looks about the same as 6400 on my gh3, this is unreal :)

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Old April 10th, 2014, 11:00 PM   #40
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Re: New Sony A7s to shoot 4K video

Yes high iso on this camera is crazy. I tested it at the show and iso 12800 had just very little noise 100% usable. At iso 16000 you see the noise more clear so I would not go higher than this.

BTW, I switched it from 4k to Full HD and could see a little bit more noise in the dark areas then. So maybe the readout works different than in UHD mode. But again 12800 was looking good to my eyes in HD and 4K mode.
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Old April 11th, 2014, 01:13 AM   #41
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Re: New Sony A7s to shoot 4K video

Was able to download the 3840 and 1920 10000kbps MP4 clips if anyone wants to download and look at them. Not too bad. Would love to see the original 50mbps XAVC-S LGOP clips.

https://www.sendspace.com/pro/dl/0xh14k

User name leave blank

Password" A7s000

Beware this is a 250MB download.

Chris Young
CYV Productions
Sydney

Last edited by Christopher Young; April 11th, 2014 at 01:15 AM. Reason: Additional info
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Old April 11th, 2014, 09:46 AM   #42
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Re: New Sony A7s to shoot 4K video

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Old April 11th, 2014, 10:18 AM   #43
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Re: New Sony A7s to shoot 4K video

bad rolling shutter


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Old April 11th, 2014, 10:22 AM   #44
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Re: New Sony A7s to shoot 4K video

amazing low light

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Old April 11th, 2014, 11:35 AM   #45
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Re: New Sony A7s to shoot 4K video

In the old days they were shooting " day for night"
Nowadays we will shot "night for day"

:-)
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