The 105mm F2.8 DG DN MACRO | Art features a range of advanced functionality that opens up a range of new shooting possibilities for both photographers and filmmakers.
The lens has an AF/F switch that toggles between automatic and manual focus. In manual focus, the focus ring has a very smooth action and using the SIGMA USB Dock (L-Mount only), the AF sensitivity can be customised. The focus throw is quite large by default to allow for precise manual adjustment when shooting macro subjects.
In a similar way to the 85mm F1.4 DG DN | Art and 35mm F1.2 DG HSM | Art, an aperture ring allows users the option of controlling their aperture setting either via the camera or the lens.
The dial can be de-clicked using a switch on the lens barrel, which allows film-makers to tweak aperture during movie shooting without stepped changes to exposure, and this also allows quieter operation which can be very useful when shooting close-up subjects. An aperture ring lock button eliminates the risk of accidentally knocking the aperture ring from auto to manual or vice versa.
Also on the lens barrel is a Focus Limiter Switch that allows users to limit the lens’ focusing range, resulting in faster overall AF performance. There are three settings: 0.295m-0.5m, 0.5m-infinity, or FULL. Adjacent to the Focus Limiter Switch is an AFL button, to which users can assign a particular function via the camera menu. This button sits in a convenient position to be controlled by the thumb and is useful for focusing control.