This is the lens I'm currently using, a Tamron 70-300mm Full-frame lens, and the aperture varies from 4.5-6.3. Since I'm using it on an APS-C camera (Sony α6500), I get almost zero vignettes and sharper corners. For weaknesses, dust does come in and has poor low-light performance due to a small aperture and no OIS. Overall, it's an affordable brilliant lens.
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