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eye focus and face recognition on A7r2 not working

a7r2 eye focus face recognition

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#1 adwb

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Posted 22 May 2017 - 03:35 PM

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Hi on Saturday , not for the first time, I gave up trying to use the eye focus on my A7r2.
It matters not which lens I have fitted, but the acquisition of a face square and the eye focus square are random to say the least.
 
 Given the praises that have been sung over these focusing aids I have to assume I have something not set correctly.
 
I was taking 20-30 images of 50 models at speed  so I tried both continuous and single focus modes, full focus area and zone are and even centre area. I have face recognition turned on and eye focus assigned to c3 button.
 
 I was shooting with studio  lights at f8 _ 1/160 _ iso 100 all day .
Is there a focal length that works better, I see videos of people using all sorts of focal lengths and still saying how brilliant the eye focus is.  
 
 I found standing in roughly the same place and the models the same that the face recognition was totally random when it appeared. The images them selves are fine , in fact every one is in focus so thats not a issue.
 
What are the aperture and other parameters that you have found that allow the camera to regularly find faces never mind the eye focus? 


#2 Ersin_Ulasli

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Posted 22 May 2017 - 08:27 PM

Thats weird bacause the eye AF works pretty well, even on a first generation a7 with the kit lens when it is wide open..

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#3 adwb

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Posted 26 May 2017 - 01:06 PM

yes I think the lens needs to be wide open for it to work consistently and that's a problem when the lighting even on minimum power requires f4.5 or smaller 



#4 tinplater

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Posted 26 May 2017 - 11:00 PM

I think it may be the models at speed that is the problem.  I have no issues when using for portrait type photos, but of course the subject is generally just sitting there.



#5 thomasedi

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Posted 29 May 2017 - 03:27 PM

What lens are you using? My A7r doesn't have any problems on Sony 28 and Batis 85, even when when closed to f7.

#6 adwb

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Posted 31 May 2017 - 02:17 PM

What lens are you using? My A7r doesn't have any problems on Sony 28 and Batis 85, even when when closed to f7.

makes no difference which lens;  kit lens ,90 macro ,50 mm,  all the same.

 

it seems to me that you need to be shooting 3/4 or tighter shots for the face recognition or the eye focus to be selected shot after shot 



#7 photomnemonic

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Posted 02 June 2017 - 02:59 PM

The only time I experience this is when I'm doing full length shots of a model, framing it tightly, and some of the head/ face falls just outside of the focus area.  





Also tagged with one or more of these keywords: a7r2, eye, focus, face, recognition

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