Optically fine with no fungus or haze, just a few very faint cleaning marks (this has no effect on images). Iris is smooth and snappy with no sign of oil. Focus and zoom are smooth and snag-free. Aperture ring is free and very positive with no slack.
The Sigma 18-35mm f1.8 DC HSM Lens is the first wide-angle to zoom lens (as of 22nd April 2013) to achieve a maximum aperture of f1.8 throughout the entire zoom range. To ensure stability in focusing, this lens moves the inner lens group(s) without changing the lens' physical length.
Classic Sigma manual focus lens. The focus and zoom are also not working correctly. They are tough to move. The blades are stuck wide open and wont close. The photographs shown are for the actual item that is for sale.