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A7sIII Auto Focus Issue (micro jitter)


Bora
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i am having strange focus issue with my brand new A7SIII. I didn't notice it until i used my slider. Close up shot with any prime lens create this micro focus jitter (don't how to name this issue). I tested my A7III and focus is butter smooth. This is visible on a big screen. So don't watch it on your phone.

This happens a lot using a slider or gimbal (close up shots). 

It is scaled to 300 to see the jitter better (lens 24mm 1.4)

https://youtu.be/cHA9l8HSM7s


Firmware: 1.02
Settings:
XAVCS 4K 60P 4:2:2 10 Bit
Continues AF (Video mode Cine gamma 4)
AF transition speed : 4 (i also tried it with lower and higher values)
Af Subject Shift Sensitivity : 4 (i also tried it with lower and higher values)

I tried all the focus and speed value combinations but no change. I disabled the touch tracking, focus are (S,M,L and expended focus) and I reset the camera settings and no luck.
Lenses I tried :
Sony 50mm 1.4
Sony 24mm 1.4
Zeiss 55mm 1.8
Zess Batis 85mm 2.8

Recording or not recording doesn't matter so it is not a SD card issue (I use Sony v90 cards). 


A7III works perfect. If it looses focus, it catches it smoothly. A7SIII catches jumpy (regardless any setting). 
This also happens on eye tracking focus as well. 

I found two topics online about this. They didn't post a solution. I contacted Sony and waiting a call in a day or two.

If any one can test this, that will be super helpful.

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  • 4 weeks later...
  • 2 months later...
  • 3 weeks later...

It's been 1.5 years since I encountered a similar glitch on the A6300 and A6400. Lens stabilization does not matter. Appears on different Sony autofocus lenses (16-50, 35, 50, 18-105 and others). It doesn't matter if the camera is on a 3-axis stabilizer or just on a tripod. Even movement in the frame doesn't matter. The problem appears even when the frame is static. I have always set the focus speed to the slowest setting for video. Resetting the camera does not help. 

I am afraid it is the obsolescence of the camera or a miscalculation of the engineers, capacitance sagging on the electronic board and as a consequence malfunction. I have found that even new glass out of the box behaves this way with these tubes.

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  • 1 month later...

Yeah I made two topics and I am so surprise they still didn't fix it. More surprise nobody notice like how.. This is so big and no more posts? I don't get it. Don't worry it's a general issue. I tried it with every a7s3 I got to my hands. It's global bug.. Hopefuly they will fix it  soon since on detail shots I have to use my old a73..

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  • 11 months later...
On 1/14/2021 at 1:32 AM, Bora said:

i am having strange focus issue with my brand new A7SIII. I didn't notice it until i used my slider. Close up shot with any prime lens create this micro focus jitter (don't how to name this issue). I tested my A7III and focus is butter smooth. This is visible on a big screen. So don't watch it on your phone.

This happens a lot using a slider or gimbal (close up shots). 

It is scaled to 300 to see the jitter better (lens 24mm 1.4)

https://youtu.be/cHA9l8HSM7s


Firmware: 1.02
Settings:
XAVCS 4K 60P 4:2:2 10 Bit
Continues AF (Video mode Cine gamma 4)
AF transition speed : 4 (i also tried it with lower and higher values)
Af Subject Shift Sensitivity : 4 (i also tried it with lower and higher values)

I tried all the focus and speed value combinations but no change. I disabled the touch tracking, focus are (S,M,L and expended focus) and I reset the camera settings and no luck.
Lenses I tried :
Sony 50mm 1.4
Sony 24mm 1.4
Zeiss 55mm 1.8
Zess Batis 85mm 2.8

Recording or not recording doesn't matter so it is not a SD card issue (I use Sony v90 cards). 


A7III works perfect. If it looses focus, it catches it smoothly. A7SIII catches jumpy (regardless any setting). 
This also happens on eye tracking focus as well. 

I found two topics online about this. They didn't post a solution. I contacted Sony and waiting a call in a day or two.

If any one can test this, that will be super helpful.

Yes I can confirm this issue. This happening from day 1. I was from first people to have  this camera since relese and I noticed this like in few seconds of using it. I was like ok this will get fix fast this is a big issue but no.. I made multiple posts and nothing. 2y later and it's still bugged like hello Sony?!!! 

Doesn't matter what speed you have. With detail lenses this happening all the time. And to be honest it's really making my job hard.

 

PLS FIX this! - new update doesn't help btw still bugged.

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  • 1 year later...

Hi, did any of you manage to solve this issue by updating to the latest 3.01 firmware for the A7S3 body? I recently got the PZ 16-35mm F4 G lens on my A7S3 body, it also has the same issue, my firmware is still 2.11 for your information

Edited by lunag
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  • 2 weeks later...
Posted (edited)

Auto-focusing with macro lenses has all sorts of problems.  I'm not going to list all of them -- that would take a book.

That's ONE of the reasons many people use manual focusing mode -- and like me, that's why lots of macro shooters use older, manual-focusing lenses for macro work. 

Sony a-900 with Minolta AutoBellows III with AutoBellows Rokkor-X 100mm f4 lens: -- no artificial light, filtration or manipulation:

 

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Edited by XKAES
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