I think the Tamron 28-75 is the best all around lens for Sony full frame cameras like the A7III.
I purchased the Tamron 28-75 for my Sony A7III just after it was released and I haven't regretted it for a second. When it was first released lots of people questioned the durability and how well this lens would hold up over time. I can safely say after using this terrific lens in many different conditions it is extremely durable. I have used the Tamron 28-75 in glacier ice caves, out on frozen lakes, in small airplanes and hiking through the wilderness of Alaska in all kinds of weather. This lens keeps on producing great image quality no matter what I have thrown at it.
Image quality and auto focus on the Tamron 28-75mm f2.8 are fantastic. There is some slight distortion but it isn't bad at all. The image quality is extremely sharp and the colors are excellent. The auto focus is lighting quick and dead on accurate. I have rarely missed shots due to auto focus missing its mark and that is extremely important as a solo video creator and photographer. My life and work moves quick and this lens keeps up with out missing a beat.
This lens has barely left my Sony A7iii since I purchased it. I have only used a super wide angle 15mm for tight spaces and an 85mm for portraits. See all my thoughts on the Tamron 28-75mm f2.8 here:
All in all I think the Tamron 28-75mm f2.8 is the best lens buy you could make for your Sony A7III or A7RIII. For the price you cannot find a better performing lens on the market today!
You can check it out here: https://amzn.to/32aXY5F
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