Crop sensor cameras make telephoto easy — and ultra-wide insanely hard. The Tamron 11-20mm f2.8 Di III-A RXD is the widest f2.8 lens with zoom and autofocus for Sony’s crop-sensor, mirrorless cameras. Finding something close to Tamron’s new lens requires sacrificing zoom capabilities or opting for a narrower aperture: neither of which bodes well for versatility.
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