The Sigma's Art series will soon become enriched by a new macro lens. The optical system of the new lens is unique and it cannot be found in the previous models of the series.
As it is usually the case with Sigma, the lens has to be different than all other lenses available on the market. This one is equipped with a different mechanism of external focusing, which is going to be a disadvantage for many macro photographers. However, Sigma is of opinion that it is impossible to create a perfect lens of such a type, which adjusts focus not changing its external length at the same time. Zeiss lenses work in similar ways and they cannot be considered as poor with regard to optical parameters.
1). Sigma 70mm f/2.8 DG Macro Art
The optical system of the lens consists of 13 elements, placed in 10 groups, among which 6 are special low-dispersion SLD and FLD lenses. Besides that, there are also apsherical lenses, thanks to which the image sharpness is supposed to be even within the whole frame.
The lens is equipped with a 9-blade aperture and a maximum zoom of 1:1, as most of the lenses of this type. The minimum focus distance is 25.8.
Sigma 70mm f/2.8 DG Macro ART is equipped with the autofocus based on the DC drive and the sharpness can be adjusted manually with the use of a big knob.
The Sigma EM-140 DG flash, as well as Sigma USB Dock, can be connected to the lens, which is definitely going to be useful...
The lens weighs 515g/18.2oz and it has the dimensions of 70,8x105,8mm. It is fully sealed.
2). Sigma 70mm f/2.8 DG Macro Art
Sigma 70mm f/2.8 DG Macro ART will be available on sale in the versions with the Canon EF and Sony E mounts. As for now, it seems that the lens will not be available with the Nikon F mount.
The price of the lens and its date of availability have not been revealed yet.