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Problem using Sigma Art (Canon mount) with Metabones IV on A7 Mk II

steve of stonehenge
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steve of stonehenge Community Regular

steve of stonehenge

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I upgraded my A7 Mark II yesterday to firmware 2.0.  Tested with Sony 85mm Batis and it worked perfectly.  Uncompressed RAW no problem downloading to Lightroom 6.

 

I also updated the firmware for the Metabones IV to version 0.46.  

 

Mounted Sigma 24mm f1.4 Art to Metabones IV smart adapter.  Attempted to use autofocus in many circumstances: inside and outside, high contrast and low contrast, AF-C and AF-S.  I could not achieve autofocus under any circumstances.  I switched to manual focus and achieved satisfactory images.

 

Then I switched lenses to a Canon 70-200 f4 L IS lens.  Autofocus was perfect and very fast.  In fact autofocus was as fast with the Metabones IV/Canon setup as native Sony lenses.

 

I have already notified Metabones of this issue.  So for the time being, no autofocus with Sigma Art just manual.  Hopefully they can fix this with a future Metabones firmware update.

 

 

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tomapaul Contributor

tomapaul

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Hi...same problem here with sigma 24 and 35 w metabones iv. I found them to be incredibly unstable. Now they work fine...power off/on and it's not working anymore. As in not even moving the AF. I think they will update the firmware soon. What seems to bother me is that the fotodiox adapter is still working better at 1/4 the price...the only downside is... are the missing pdaf points. But it's incredible how an adapter with no possibility of firmware upgrade is still working ... and is better.

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steve of stonehenge Community Regular

steve of stonehenge

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I installed the Metabones IV firmware .47 this morning and just went outside to test it.  Good news and bad news.  The Sigma 24 Art is still not working in auto focus under any settings or circumstances.  I'm disappointed and may even sell the lens.  I have been looking at the Zeiss 25mm f2 Batis.  I already have the 85 Batis and have been very impressed.

 

But I also tested my Canon 70-200 f4 L IS.  Very fast autofocus in both AF-C and AF-S.  In previous versions AF-C would not work.  But it is spot on IQ.  Now I'm anxious to test on people to see if face recognition works.

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    • Cameratose
      Blurry images on Sony 70-350

      By Cameratose · Posted

      That's supposed to be a pretty good APS-C lens. Can you try it on a different camera just for the heck of it? Friend? Camera shop? The lens is noted for sharpness, so if you're having as much trouble as you say, you may want to look into a replacement or repair. 
    • broz_tito
      Blurry images on Sony 70-350

      By broz_tito · Posted

      Hi everyone, I’m reaching out to the community because I’m facing a persistent image quality issue with my Sony 70–350mm f/4.5–6.3 G OSS lens, and I’d like to know if this is normal behavior or if my copy is defective. Problem description: I’ve extensively compared the 70–350mm G OSS with my Sony 18–135mm f/3.5–5.6 OSS, using a Sony A6700, under controlled conditions: • Identical lighting and background • Same subject and position (LEGO figure, consistent framing) • Tripod or steady support • Manual focus or AF with center point • Same shutter speed (e.g., 1/200s), similar ISO (ISO 4000–6400), RAW + JPEG • OIS turned on (and also tested with OIS off) My observations: • At 135mm, the 70–350mm G OSS delivers softer, flatter images than the 18–135mm, even when stopped down. • At 350mm, the sharpness drops significantly – the center is soft, and textures (like LEGO tiles or fabric) appear blurred or smudged. • Contrast and micro-detail are noticeably inferior across all focal lengths. • The 18–135mm at 135mm (even cropped) retains better edge sharpness and detail definition. • Both JPEG and RAW files confirm the issue – this is not just JPEG processing or noise reduction. Question to the community: • Have others experienced similar softness with the 70–350mm? • Is it possible I have a decentered or optically misaligned copy? • Is there a known issue with OSS introducing softness at long focal lengths? I wanted to love this lens due to the range and portability, but currently it’s unusable for anything where image quality matters. I’m considering returning or sending it for service. Thanks in advance for any feedback or comparison results you can share.  
    • Pieter
      2 Primes or 1 Zoom?

      By Pieter · Posted

      I'm pretty confident OP made up his mind in the past 14 months.

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