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Auteur Sujet: Sigma 56 mm f/1,4 DC DN | Contemporary  (Lu 3072 fois)


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Re : Sigma 56 mm f/1,4 DC DN | Contemporary
« Réponse #25 le: décembre 23, 2018, 16:18:34 »
Essai du Sigma 56 mm f/1,4 DC DN | Contemporary sur Sony Alpha 7R II en mode APS-C par Arkadiusz Olech et Maciej Latałło pour :

Sigma C 56 mm f/1.4 DC DN review -

Points forts :

- fût de bonne qualité
- qualité d'image sensationnelle au centre
- résolution décente sur les bords
- faible aberration chromatique longitudinale
- aberration chromatique latérale légère
- pas de problème d'aberration sphérique
- astigmatisme modéré
- bon rapport qualité / prix.

Les inconvénients:

- performance atypique sur les bords
- forte distorsion
- énorme vignetage.

Citation de: Arkadiusz Olech et Maciej Latałło pour
Two Sigma models I’ve tested lately, the A 40 mm f/1.4 DG HSM and the smaller C 56 mm f/1.4 DC DN, can be positioned on two polar opposites. The first one is a physically huge instrument, constructed without any compromises, with fantastic optics but also a high price tag. The second one is a lightweight, handy optical device, aimed at amateur photographers; its price reflects well their average budget. Small wonder such a lens features many compromises. I could accept the weaker distortion and vignetting performance without a murmur because a fast lens in a small casing has to have a significant brightness loss. Also I am able to understand lack of optics distortion correction in this class of focal lengths; after all camera software can correct that aberration easily and, with such an angle of view, cropped images are hardly an issue.

Still weak image quality on the edge is a drag. There is a big discrepancy between resolution results in the centre and on the edge: while in the frame centre you see resolution records putting to shame the performance of lenses produced by the biggest players of photographic market, on the edge you experience a slump as the lens never reaches 60 lpmm. Perhaps it is not a significant problem for an instrument which is going to be used to take portraits or a shallow depth of field shots; still there are uses where even performance across the frame is more than advisable, even for such a focal range as this one.

All the remarks, presented above, don’t change my very positive assessment of the tested Sigma. It is another excellent optical instrument, offered at a sensible price; it shows that pricing of other producers of mirrorless devices is really over the top.


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Re : Sigma 56 mm f/1,4 DC DN | Contemporary
« Réponse #26 le: février 19, 2019, 14:17:41 »
Essai du Sigma 56 mm f/1,4 DC DN | Contemporary sur Sony Alpha 6000 par Mark Goldstein pour Photography Blog :

Sigma 56mm F1.4 DC DN C Review | Photography Blog (5 pages)

Citation de: Mark Goldstein, Photography Blog
The Sigma 56mm F1.4 DC DN C is a very appealing mid telephoto prime lens, especially on the Sony E system where it has relatively few rivals.

Offering a classic focal length of 84mm for APS-C compact system cameras and a slightly longer 112mm for Micro Four Thirds cameras, the third lens in Sigma's f/1.4 trilogy exhibits acceptable sharpness wide-open at f/1.4 (at least in the centre) and excellent sharpness from f/2 onwards. Bokeh is very attractive thanks to the 9-blade design and telephoto focal length and chromatic aberrations are very well controlled. The only fly in the image quality ointment is very obvious pin-cushion distortion, which will need to be corrected in post-processing.

The build quality of the Sigma 56mm F1.4 DC DN C is very good, weather-sealing is a bonus, and the size and weight make it a great fit on the smaller APS-C and Micro Four Thirds bodies. It doesn't offer built-in vibration reduction, though, which won't please owners of older camera bodies, but anyone with a camera that does feature image stabilisation won't find it a problem. Sigma have even generously included a very good circular lens hood.

The auto-focusing system proved to be pretty quick and reliable on the Sony A6000 camera that we tested the lens with, and manual focus over-ride at any time is a great feature. The minimum focusing distance of 50cm / 19.7in isn't really anything to write home about, though, limiting the kinds of subjects that you can shoot at close quarters.

The modest asking price of £399.99 / $479.99 for the Sigma 56mm F1.4 DC DN C is very reasonable for such a fast, well-built lens that overall delivers great image quality. Other than the pincushioning and modest focusing distance, there's very little to complain about and lots to like, making the third and final lens in Sigma's APS-C trilogy our firm favourite.