The TAMRON 150-500mm f/5-6.7 Di III VXD Lens for Sony E is an interesting lens. Everyone’s comparing it to the Sony 200-600mm G lens but it actually behaves rather like the Sony 100-400mm GM lens in focal length and aperture, up until close to 400mm.
I’m tempted to buy one, but its vibration control is not nearly as good as the Sony 100-400mm GM lens when used for video. You’re limited to 15FPS on the Sony a1. The image quality, specifically the contrast, is not as good. There’s significant field curvature. Some reviewers are stating the corners are soft, but if you focus in the corners, you’ll notice the lens is sharp. For landscapes, this is not good.
To me, the Sony 100-400mm GM lens gives you quite a bit of reach, but it’s also short enough to be a highly versatile lens for other things. For that reason, I might give the tamron a miss. On the other hand, for the same money, you can buy an additional lens.
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