Hello, I'm pretty new to Photography, I use a SonyA7iii and want to be able to photograph Football(Soccer) games and wild life from a distance with a good zoom and I was thinking of getting the Sigma 150-600mm lens and happen to stumble across the A mount version of the Sigma and was wondering what mount adapter I would need for my A7iii? 

Thank you! 

You'll need an adapter to put the A mount version on the camera. There are several A mount adapters from Sony, and it can be a bit tricky choosing the right one. I'm not an expert - you'll need to do some research. Which adapter is best depends on the camera, and on the lens (although I though the Sigma 150-600 is not a screw drive lens, which eliminates one part of the equation).

You should also pay attention to the limitations you get - some adapters don't support all the functionality of the lens.

After I had a bit of a look at it all, I chose to go for native E mount lenses. I didn't want the hassle 😞 

The A7 III needs the LA-EA4 for autofocus and tracking. Usable features depend on the lens.

You may be disappointed with response. I've used the LA-EA4 on an A7R III and the LA-EA5 on an A7 IV and A1. In all cases, there is a split-second delay before the lens responds when focusing. You have to learn to anticipate, which can be very difficult and frustrating for action photography. 

Even though there will be more cost, I recommend you look at E mount only for action. You can at least subtract the $200 or so for the adapter. 

You should be able to use anything from 400-600mm for soccer, and there are lots of choices available to you.  

Edited September 9, 20241 yr by Cameratose