Can't focus with LA-EA3 with Sigma lenses on A7RII

[kenwind86]

I 've just received my LA-EA3 lens adaptor and tested my long waited Sigma A mount lenses but I 've been having trouble with the focusing.

 

Sigma 35mm f1.4 Art works perfectly with both phase detection mode and contrast AF mode.

 

Sigma 50mm f1.4 Art cannot focus at all, it jumps between closest focal point and 4 feet.

 

Sigma 70-200mm f2.8 DG seems to be able to set a focal point but is out of focus.

 

Does anyone has any of the problems? What would be the problem? The lenses or the camera?

 

Would a firmware update on the camera or the lens fix those issues?

 

Please help!~

[Golem]

Abandon all hope, ye who enter here ....

 

 

Sigma stuff can be unpredictable cuz they reverse

engineer everything. Other third party designers

just pay to license the OEM design technology.

 

Sigma's FW updating dock is not really a terrific

feature. It's just Sigma dumping their problem the

user's lap, and asking the user to pay for it as well.

 

A FW update on the lens may help, or not. OTOH

FW updating the camera can actually cause such

problems as you are experiencing ... typical of the

reverse engineering syndrome.

 

`

[kenwind86]

Abandon all hope, ye who enter here ....

 

 

Sigma stuff can be unpredictable cuz they reverse

engineer everything. Other third party designers

just pay to license the OEM design technology.

 

Sigma's FW updating dock is not really a terrific

feature. It's just Sigma dumping their problem the

user's lap, and asking the user to pay for it as well.

 

A FW update on the lens may help, or not. OTOH

FW updating the camera can actually cause such

problems as you are experiencing ... typical of the

reverse engineering syndrome.

 

`

Thank you for the explanation, ended up getting a LA-EA4 as well, though it is not as fast with the LA-EA3 on 35mm ART but at least it does the job. Should have bought Metabones with Sigma Canon mounts which would work out much better and probably cost the same. This Sony mounting issue is very confusing. 

[tomapaul]

Try this: open aperture from 1.4 all the way to 16 and back. Then try to focus. Had similar problems with sigma 24mm art and fotodiox adapter.

[kenwind86]

Try this: open aperture from 1.4 all the way to 16 and back. Then try to focus. Had similar problems with sigma 24mm art and fotodiox adapter.

 

Did it work for you? I tried but no luck.