The Sigma 18-35mm f/1.8 DC HSM lens now also available for pre-order for Sony A-mount and Pentax mount, the price is same as Canon and Nikon mount for $799. And the release date is on July 31, 2013.
Sigma 18-35mm f/1.8 DC HSM for Sony | B&H |
Sigma 18-35mm f/1.8 DC HSM for Pentax | B&H |