Designed for APS-C sized sensors, the Sigma 50-100mm 1.8 DC HSM Art features an enhanced and slimmer Hyper Sonic Motor (HSM) which provides fast and accurate autofocus. Each lens is hand crafted in Aizu Japan,individually inspected before shipping and works with the Sigma USB Dock to update firmware and focus calibrate. Incredible image sharpness is provided by three Premium FLD elements and one SLD element, and the durable and wear-resistant polycarbonate diaphragm has blades featuring carbon feather film, providing smooth operation even during continuous shooting. Video inspired inner focus and inner zoom rings do not change the length of the lens and allow for operation without shifting focus.
SIGMA DC Lenses
Optimized for DSLRs with APS-C size image sensors, these lenses leverage original technology fostered in the development of Sigma SD series cameras. The configuration of lens elements and the lens coatings represent the culmination of decades of optical engineering experience. The result is truly excellent performance in a compact, lightweight format that offers outstanding flexibility to the serious photographer.
The HSM (Hyper Sonic Motor) ensures a silent, high-speed AF function. By optimizing the AF algorithm, smoother AF is achieved. Also, this lens offers full-time MF by rotating the focus ring of the lens while auto focusing. Without changing the AF/MF Focus Mode Switch, it allows faster focus adjustment.
The Technical Details:
To minimize axial and transverse chromatic aberration, this lens features an optimal arrangement of three FLD (“F” Low Dispersion) glass elements, one SLD (Special Low Dispersion) glass element, three high-refractive index SLD glass elements, and one high-refractive index, high-dispersion glass element. By including one or more low-dispersion element in every element group, this lens ensures outstanding image quality throughout the zoom and focal range. To achieve smoother and quicker operation, the exceptionally durable and wear-resistant polycarbonate diaphragm has blades featuring carbon feather film, providing exceptionally smooth operation even during continuous shooting. Designed with videography in mind, the inner focus and inner zoom rings do not change the length of the lens and allow for zoom ring operation without shifting focus.
More Reasons to Choose a SIGMA Lens:
Inspecting each and every lens with their proprietary Foveon-based A1 MTF measuring system, SIGMA delivers premium quality lenses.
“Made in Japan” craftsmanship is what makes SIGMA lenses high-performance, high-quality, and high-end.
The SIGMA USB DOCK accessory and exclusive software let you personalize the specification of your new Sigma lenses.
7 YEAR WARRANTY
Sigma stands behind its lenses with a 7 year international warranty. It guarantees your Sigma 10-20mm f3.5 EX DC HSM Lens against manufacturing defects for seven years from the date of the original purchase.