May be fake, but, the rumored specs are thus. I hope it's true, because Sigma has really been pushing things forward lately
Designed for APS-C based DSLR cameras
Ultrasonic autofocus (HSM)
9 aperture blades
Type A (Art), which guarantees quality materials, metal bayonet
Filter size: 72mm
Minimum aperture: f/16
Lens construction: 17 elements in 12 groups
The maximum magnification ratio: 0.23x
Weight: 810 grams, length: 121mm
Angle of view: 76.5 - 44.2°
Internal zoom and focusing
Minimal focusing distance: 28cm
http://photorumors.com/2013/04/17/sigma-18-35mm-f1-8-dc-hsm-lens-leaked/
Designed for APS-C based DSLR cameras
Ultrasonic autofocus (HSM)
9 aperture blades
Type A (Art), which guarantees quality materials, metal bayonet
Filter size: 72mm
Minimum aperture: f/16
Lens construction: 17 elements in 12 groups
The maximum magnification ratio: 0.23x
Weight: 810 grams, length: 121mm
Angle of view: 76.5 - 44.2°
Internal zoom and focusing
Minimal focusing distance: 28cm
http://photorumors.com/2013/04/17/sigma-18-35mm-f1-8-dc-hsm-lens-leaked/