Sigma 70-210mm f/4-5.6 UC Zoom - Unknown Mount

The Sigma 70-210mm f/4-5.6 UC (Ultra Compact) is a highly portable telephoto zoom lens. Designed to be significantly smaller than traditional 70-210mm lenses, it is an excellent choice for hikers or travel photographers who require telephoto reach without the bulk. Despite its small size, it maintains a versatile range suitable for wildlife and candid portraits, featuring multi-coated optics to ensure decent image quality throughout the zoom range. When purchasing a used UC series lens, check the external barrel for the 'tacky' texture that sometimes develops on the rubberised coatings used by Sigma in the 1990s. SDS tests the autofocus speed and accuracy, ensuring the internal gears are not worn. The lens should also be checked for internal dust and the smoothness of the zoom action, as the compact internals are sensitive to impact or forced movement.