Best DSLR Telephoto Zoom Lens Sigma 50-100mm F1.8 DC HSM | Art
This constant aperture APS-C zoom lens offers an effective focal length of 75-150mm. It is constructed with 3 FLD ("F" Low Dispersion) and 1 SLD (Special Low Dispersion) elements (21 elements in 15 groups in total) and contains an updated (slimmer) Hyper Sonic Motor for accurate and fast AF performance. The lens has a 9-blade, rounded diaphragm and has a close-focusing distance of approximately 1 metre. As with all SIGMA SGV lenses, each lens unit is individually tested prior to shipping and works with the SIGMA USB DOCK to allow firmware updates and focus calibration in the future.