The 50mm delivers sharp photos at almost all apertures.
The revised 18-200mm f3.5-6.3 macro lens sports the same fit and finish as Sigma's latest models.
Featuring the same focal length as a popular model from Canon, the new Sigma 24-105mm lens looks as though it will be a fierce competitor to the old workhorse.
While it's not cheap, the Sigma 50mm f1.4 lens provides great value for the money.
The lens manufacturer has launched its Mount Conversion service, which will let you update any of its newer lenses to a compatible mount on demand.
The trio of Foveon-based cameras announced in February are priced similarly to their predecessors.
Pricing not available
Lens announcements are not normally a reason to get excited, but this model from Sigma should change that.
The new lens, part of Sigma's high-end "art" product line, will ship in November, but its true competitiveness won't be known until Sigma reveals its price.
A look at the Sigma APO 70-200mm F2.8 EX DG OS HSM telephoto zoom lens and some of the shots it's good for.
Photographers who switch between brands no longer need to worry about selling their existing third-party lenses. Sigma is offering a service that will change a lens mount for a fee.