A7SII Aliasing in 1080 50p
When shooting 1080 25p there is very little aliasing in the image, however switch to 50p and there is noticeable aliasing. Why should this be? The frame size is the same... Would a separate recorder be the answer? In other words is it a bitrate issue?
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Re: A7SII Aliasing in 1080 50p
Hi Chris
With my EA-50's I used to get it really bad at 50P but clean at 25P ... it has been said that 50P needs a minimum bitrate of 50mbps to give a clean image so I used to shoot in 25P which is less taxing on the codec. It was also worse in the AVCHD codec too ..On my Pannys I can shoot in MP4 with no issues but in AVCHD on the Sony I used to get problems as well with pixellation and even posterization issues on overexposed portions of the image ... Do you have to shoot at 50P??? Does the A7S have other formats you can use ..might be worth testing them?? |
Re: A7SII Aliasing in 1080 50p
As I recall that pixelation problem was because of a certain preset that was used, I don't remember having any issues with 25p vs 50p on my nex-ea50 though.
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Re: A7SII Aliasing in 1080 50p
It is like that with Sony A7s also.
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Re: A7SII Aliasing in 1080 50p
There is no enough speed/power/cooling to make full pixel readout at 50P by full frame. So there is line skipping like in other cameras. You can have very clean 50P i APS-C mode.
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