The Sigma 30mm F1.4 EX DC HSM lens is a redesigned version of Sigma's popular 30mm F1.4 prime. On APS-C cameras this lens covers an effective focal length of approximately 45mm, making it a very useful standard focal length. The new lens has an optical configurations of nine elements in eight groups, including a double-aspheric element, with rounded aperture blades for attractive blur in out of focus areas. The new 30mm F1.4 is also compatible with Sigma's new USB Dock, which will enable firmware updates and focusing adjustments.