Here is the size comparison between he new Sigma 28-70mm f/2.8 DG DN Contemporary lens that will be announced on February 24 and the Tamron 28-75mm FE..
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Alan:
Thought viewers might want to see a video all filmed using the A7SIII using 3 lenses: The Sony 200-600mm with a 1.4x TC, Sony 20mm f/1.8 and the Tamron 70-180mm f/2.8. https://youtu.be/hdgbTS01MrI
Here are the first images of the new Sigma 28-70mm f/2.8 DG DN Contemporary lens that will be announced on February 24. It will compete against the Tamron 28-75mm FE and cost around $900.