TELEPHOTO ZOOM LENS: SIGMA - 50-150mm f/2.8 EX OC HSM: Fast telephoto zoom designed for APS-C DSLRs

摘要

Sigma's new 50-150mm is designed for use on an APS-C DSLR, delivering a 35mm focal length equivalent of 75-225mm on a DSLR with a 1.5x crop factor, providing a short to medium telephoto range with a fast maximum aperture of f/2,8. Designing a zoom of such proportions for comfortable use can be tricky and Sigma's engineers clearly envisage that this lens will be used with its removable tripod collar attached as this provides a comfortable platform when supporting the lens in the hand. The manual-focusing ring is forward of the collar but is slightly too close for easy reach; the more distant and much broader zoom ring, on the other hand, is perfectly placed and offers just the right amount of resistance.