This Zoom F1.8 Constant de Sigma arrives on July 10, and it changes everything for APS-C hybrids
Good news for all users of APS-C hybrids, Sigma continues to develop this objectives segment! After the already very noticed 16-300 mma TransTandard megazoom, here comes the time of a new transtandard zoom also, with a more reasonable focal range which has the distinction of offering a maximum constant ultra -light opening.
The SIGMA 17-40mm F/1.8 DC Art therefore offers a focal range equivalent to a 25.5-60 mm taking into account a conversion coefficient of 1.5x. Used on a cannon hybrid, it is even more precisely an equivalent 27.2-64 mm, because the coefficient is 1.6x. This focal range is ideal for many uses of naturally ranging from reporting (architecture, street photo), its favorite field, but also why not for landscape and even portrait.
A generous and constant opening
The unique particularity of this objective is its maximum constant and ultra -light opening. Indeed, this zoom opens to f/1.8 Constant with a circular diaphragm with 11 strips! This opening will obviously help to photograph handshake in low light conditions, but it will also open the door to ultra -marked bokeh effects with low field depths. This is not the first time that Sigma has crossed this famous Constant F/2.8 bar. Recently, the manufacturer has developed a 28-45mm f/1.8 DG DN In range Art also, and capable for its part to cover the 24×36 mm. If we go back to the era of reflex, we can even quote the 18-35mm f/1.8 DC HSM Art And his big brother, the 50-100mm f/1.8 DC HSM Art (perhaps a future Sigma hybrid objective for the future).
The objective uses an optical formula composed of 17 elements divided into 11 groups, including 4 SLD glasses and 4 aspirial lenses. The manufacturer announces excellent optical performance comparable to those obtained with fixed focal lengths. The manufacturer has particularly worked on the optical correction of the axial chromatic aberration and the sagittal coma. We also find the Super Multi Layer treatment to take into account flare and incident lights.
Regarding construction, there is a constant conception with its internal zoom mechanism, an undeniable advantage in the field, for example on a gimbal. The objective is naturally protected against bad weather with resistance to dust and splash. It measures 11.59 cm long for a weight of 535 grams. Ergonomics level, there is a contained or continuous diaphragm adjustment ring with a lock system. It also has 2 programmable afl buttons.
Autofocus level, we find the Silent HLA motorization, fast and high precision. The manufacturer has also worked on the Focus Breathing phenomenon, which is, according to him, deleted. The minimum focusing distance is 28 cm for a maximum magnification ratio of 1/4.8.
Availability and price
The new sigma 17-40mm f/1.8 DC | Art will be available from July 10, except for the Canon frame which will be available in August 2025. It will be offered at a price of € 999.
