Lens review

Sigma 70 mm f/2.8 EX DG Macro

18 April 2012
Arkadiusz Olech

3. Build quality

The EX symbol (meaning Excellence) on the casing of the Sigma always obliges to something but you have to admit the lens fulfills all its obligations perfectly. The casing is very solid, quite massive and stylish. Apart from a clear distance scale we have at our disposal a manual focus ring which seems to be a bit too narrow taking the dimensions of the lens into account. However it works smoothly and with utmost precision.

On the side of the casing we see an autofocus mode switch – it can be set at full or limited (from 0.257 to 0.48 of a meter or from 0.55 of a meter to infinity). In the limited mode of the second range the dimensions of the lens change just by about one centimeter. When you pass to the full range mode and you set focus starting with the minimum possible distance the front element system extends by as many as six centimeters.

Sigma 70 mm f/2.8 EX DG Macro - Build quality

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Sigma 70 mm f/2.8 EX DG Macro - Build quality

The construction of the Sigma 2.8/70 includes one SLD glass (Special Low Dispersion) elements and two high refraction index elements which are supposed to ensure good correction of any chromatic aberrations. Overall the lens consists of 10 elements positioned in 9 groups.

Sigma 70 mm f/2.8 EX DG Macro - Build quality

The DG symbol on the casing lets us know that the lens was given anti-reflection multi-coatings to damp down all flares, including those being a filter sensor reflections.

Typically for a Sigma a quite rich accessory kit is being included in the box. Buyers get both caps, a hood and a solid hard case.

Sigma 70 mm f/2.8 EX DG Macro - Build quality