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I bought a 1991 copy of this lens recently and am using it on a Sony A7. The product picture here is of the ROM version. Mine is a 3-cam. The optics are by Sigma, made in Japan using Hoya glass. At 28 mm you would expect some barrel distortion and vignetting but it's imperceptible Centre sharpness is good wide open, improving as you would expect as you stop down. f8 produces good overall sharpness except in extreme corners. The lens doesn't appear to rotate when zooming and you can zoom in for focus and zoom out without losing it. At 70 mm there is noticeable pincushion distortion - something that would need correcting for architectural shots. Colour and contrast are good and you won't need to reach for the clarity slider in Lightroom. Nevertheless it's not a Leitz lens, but a good effort by Sigma and entirely acceptable. I would give it 3.5. I read somewhere that the ROM version was made by Kyocera using Sigma's optics and it is certainly physically more attractive.
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