EXCERPT page containing first few paragraphs. 2019-08-21 20:50:09
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This aperture series at distance shows the performance the Sigma 24-70mm f/2.8 DG HSM Art at 70mm from f2.8 through f/11.
This series is shown reluctantly, mainly for confirmation of the very poor performance seen at the other focal lengths: badly blurred edges. Here at 70mm it is at its worst.
Companies that allow seriously out of whack lenses to ship to customers are offensive. My reward for all the hours spent in non-repeatable rare conditions is crap-grade images. There is no recovery from that. Shame on Sigma for letting a sample like this ship to customers.
Sigma claims to MTF test its lenses. How can a lens so obviously 'off' be shipped to customers? I at least want to give Sigma the benefit of that doubt that this is a bad sample, but how the hell does a lens so bad ship at all? It’s shameful. . Any consumer-grade $99 zoom can beat the garbage performance seen here. Considerable skepticism is needed for Sigma lens quality it seems, on the claims of MTF testing.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
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