1. 17-50mm focal length with aperture f / 2.8 2. Di II Digital SLR Zoom Lenses for APS-C format and the like, Low Dispersion Aspherical Multiple Inner Focus, Scale Magnification 1: 4.5 3. Compatible with 62mm filters 4. Di II Zoom to SLR, APS-C, Low Dispersion Aspherical Multiple Inner Focus, 67mm filter diameter