Sigma 50-100mm F1.8, 30mm F1.4 and E-mount Adapter
2016-02-23 With the 50-100mm F1.8 DC HSM Art, Sigma announces a high-intensity zoom lens for APS-C sensors that aims to replace many fixed focal lengths. It is a supplement to the 18-35mm F1.8 DC HSM type, even if the focal length range is not directly connected. With the new 30mm F1.4 DC DN Contemporary, Sigma introduces a new high-speed standard lens for the Sony E-Mount and Micro-Four-Thirds. For e-mount photographers, Sigma has a special treat in store with the Mount Converter MC-11, which allows Canon and Sigma lenses to be connected to an E-mount Alpha, including phase-autofocus support.
The Sigma 50-100mm F1.8 DC HSM type has an equivalent focal length range of 75 to 150 millimeters as the APS-C objective and covers the small-format equivalent fixed focal lengths 85 mm 1.8, 105 mm 1.8 and 135 mm 1.8. The elaborate optical construction consists of 21 elements in 15 groups. Three FLD glass elements, one SLD glass element, three SLD glass elements with a high refractive index and other special glasses are to ensure the high image quality. The optical design should not only guarantee a consistently high image quality over the entire zoom range, but also minimize color fringing. The optical design has also been designed to minimize ghosting and reflections. Due to the high bezel diameter, a complex construction is required so that the bezel can wear and close quickly and open. The nine diaphragm blades have a carbon fiber coating, and the diaphragm unit consists of a fluorinated polycarbonate.
Sigma has also optimized the ultrasound autofocus drive HSM, which is now 30 percent smaller. Both focusing and zooming are done internally. The manual focus ring allows intervention in the focus at any time to correct it. The 50-100mm F1.8 DC HSM type has a high quality construction and features a brass bayonet, for example. Sigma emphasizes that the lens is being built in Japan. The scope of delivery includes not only a lens hood but also the matching tripod clamp for at least 1.5 kilograms heavy lens. It is expected that the Sigma 50-100mm F1.8 DC.
With the 30mm F1.4 DC DN Contemporary, Sigma introduces a new high-speed standard lens for mirrorless APS-C and Micro Four Thirds cameras. While on a Sony E-mount camera results in a slightly wider-angle normal focal length with 45 millimeters of small screen equivalent, corresponds to the lens on a MFT camera a rather long normal focal length. Since the lens is designed for the APS-C image circle, it is also quite large for MFT ratios. After all, just under 65 millimeters in diameter and 73 millimeters in length measures the 265-gram lens. For comparison: The Panasonic Leica DG Summilux 1.4 / 25mm Asph. weighs 200 grams and measures 63 times 54 millimeters, so it’s almost two inches shorter.
The optical design of the Sigma 30mm F1.4 DC DN Contemporary consists of nine elements in seven groups. An aspheric and a double-sided aspherical element as well as some special glasses are to ensure a high image quality, with Sigma leaves the correction of distortion to the camera body. Focusing is provided by a stepper motor, which makes the lens ideal for video recording. The optical construction should be insensitive to ghosting and reflections, in addition there is a particularly long lens hood in the scope of delivery, which has an anti-reflective coating on the inside. For a beautiful bokeh not only the high light intensity, but also with the nine slats to provide very round aperture. The Sigma 30mm F1.4 DC DN.
The new Mount Adapter MC-11 is particularly interesting for photographers who use Sony’s mirrorless system camera in addition to their DSLR from Canon or Sigma. It is not just a mechanical adapter, but the electronics including aperture and autofocus control is fully supported. However, there are some restrictions. Only Sigma lenses with Canon EF connector are supported, not Canon lenses with EF connector. The necessary control data for the currently supported 15 lenses of the lines Art, Sports and Contemporary namely sit in the firmware of the adapter. For new lenses will need an update, what you need the USB dock. The compatible lenses include both APS-C and full-frame lenses, with the adapter passing the appropriate information to the chassis so that Alpha-7 family cameras can automatically switch to the smaller sensor format. Autofocus is supported by all cameras, whether they have contrast and / or phase autofocus. A continuous focus is not possible. The function DMF (direct manual focus) is only supported by some lenses.