Sigma C 90 mm f/2.8 DG DN review - Summary

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Sigma C 90 mm f/2.8 DG DN

8 November 2021

Maciej Latałło

11. Summary

Pros:

solid, weather-sealed mechanical construction,
excellent image quality in the frame centre,
very good image quality on the edge of the APS-C sensor,
good image quality on the edge of full frame,
moderate lateral chromatic aberration,
very low coma,
good correction of astigmatism,
moderate vignetting on the APS-C sensor,
quite fast and silent autofocus.

Cons:

huge vignetting on full frame,
distinct distortion level,
performance against bright light leaves something to be desired,
noticeable spherical aberration.

My feelings after this test are mixed. On the one hand image quality of the small, shapely Sigma is able to put to shame most of its rivals. On the other hand the lens had several unexpected slip-ups, concerning, for example, ghosting and flares or high distortion level. It all would be forgivable if the price was adequate to the performance and, I suppose, it's not the case. Currently the Sigma C 90 mm f/2.8 DG DN costs about $640 and for a similar amount of money you can get e.g. the Canon RF 85 mm f/2 Macro IS STM, a lens optically more complex, faster aperture wise, with a macro mode and an optical image stabilization system. If a brand-name producer is able to offer you far more for roughly the same price Sigma should rething seriously their pricing policy and, perhaps, add some cashback refund or a special offer to the bundle.

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Of course my complaining cannot change the fact that the tested lens is a well-put-together instrument. However, I admit that, while looking at the number of elements, its aperture fastness, and the price, my expectations grew. Perhaps they grew too high...