Bigma won't focus with my a7iii

Started 3 months ago | Questions thread
Karl Scharf
OP Karl Scharf Veteran Member • Posts: 4,082
Re: Bigma won't focus with my a7iii

Ha Pham wrote:

Karl Scharf wrote:

Just received an a7iii, my first FF digital camera, very impressive. Love it so far.

Was hoping I could use my Sigma 50-500mm DG OS HSM lens with this camera, but it will not hold focus. I have tried all possible settings with no luck. Just keeps hunting in AF.

This lens auto focuses perfectly with my a77ii even with a 1.4x teleconverter!

My 24-70mmm and 105mm macro Sigma A-mount lenses also auto focus very nicely and quickly with the a7iii.

Any advice or possible workarounds?

Hi Karl,

I used the older A-mount Sigma 50-500 lens (no OS) + LA-EA4 with my Sony A7r and A7iii with no problem in auto focus.


I really don't want to spend the money on the LA-EA4 adapter. For now, I am just going to get used to manually focusing this lens using the focus peaking function.

Manually focused at 500mm

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...."Sony, your crap is so good" this quote!

 Karl Scharf's gear list:Karl Scharf's gear list
Sony a7 III Sigma 24-70mm F2.8 EX DG HSM Tamron 28-300mm F3.5-6.3 Di VC PZD Samyang 12mm F2.8 Fisheye Tamron 17-28mm F2.8 Di III RXD +15 more
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