APO-VARIO-ELMARIT-SL 1:2.8–4/90–280

Fast autofocus

The focal length range of the fast APO-Vario-Elmarit-SL 1:2.8–4/90–280 is matched to the Vario-Elmarit-SL 1:2.8–4/24–90 ASPH. Together, the two lenses cover the full focal length range of 24 up to 280 mm.

The newly developed double internal focusing (DSD ^® ) enables fast autofocus. The optical image stabilization enables exposure times to be extended by up to 3.5 f-stops.

AF system with Dual Syncro Drive™
From 0 to sharp in a fraction of a second

The autofocus of these lenses is fast, precise and quiet. The drive unit determines the performance data of the AF. These are limited by the weight of the focus lenses, the travel from infinity to the close range and of course the available space. In order to maintain the compactness of the lenses, these components must be integrated in a holistic approach.

An interdisciplinary team of optics, mechanics and electronics developers has developed a unique lens concept based on double internal focusing. This system, which consists of two particularly light focus lenses, allows the use of small and compact drive systems. In addition to the spatial restrictions, the selection of drive motors is also determined by the AF principle.

In order to determine the correct focus direction and then focus precisely, several contrast measurements are necessary at different focus positions. To do this, the focus lenses must be moved quickly back and forth according to the speed specifications of the contrast AF system. This requires a dynamic drive with no play.

These lenses use extremely powerful and robust stepper motors with Dual Syncro Drive™. These can cover the entire focusing range in just a few fractions of a second. This means that these lenses achieve the best values ​​in terms of speed, precision and noise emissions among full-format systems.

construction in detail

Among the 23 lenses, divided into seven moving assemblies, seven glasses with anomalous partial dispersion are used to correct chromatic aberrations. The movement of the two focus elements is carried out by a newly developed drive consisting of linearly guided lenses with stepper motors. A special feature is the constant length when focusing and zooming.

The lens hood supplied suppresses annoying reflections and stray light. The lens is equipped with a removable tripod base for attachment to a tripod. Its ergonomic design makes it easy to carry in the hand and attach a lens strap. The lockable tripod collar allows the lens to be fixed at any angle. There is a stop every 90 degrees to quickly switch between landscape and portrait format.