Update: the price of the lens is $899.
The Sigma 24-105mm f/4 DG OS HSM is one of the rumored new DSLR lenses to be announced in 2014 and yesterday CanonRumors published the first picture of the new lens. The basic specs are: 82mm filter, weigh of 885 grams, lens design: 19 elements in 14 groups (for comparison the Nikon 24-120mm f/4 weights 710g and has 17 elements in 13 groups).
I just received information that the Sigma 24-105mm f/4 DG OS HSM lens is already listed on Sigma's website:
Sigma 24-105mm f/4 DG OS HSM specifications:
|Lens Construction||19 elements in 14 groups|
|Angle of view (35mm equivalent)||84.1°-23.3°|
|Minimum focusing distance||45cm / 17.7in|
|Dimensions (Diameter x Length)||φ88.6mm x 109.4mm / 3.5in x 4.3in|
|Number of diaphragm blades||9 (rounded diaphragm)|
|Maximum magnification ratio||1：4.6|
|Weight||885g / 31.2oz|
Sigma 24-105mm f/4 DG OS HSM lens design:
Sigma 24-105mm f/4 DG OS HSM lens MTF chart: