I have the Sigma 24-70mm 2.8. not in the same league as the Nikon with build quality, and they have an annoying blip in the zoom action around the 30mm mark, but much cheaper than the nikon, and easier to source.
maybe worth a punt?
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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