We specialize in servicing and repairing all Sigma lenses, from classic manual focus models to FD to modern EF and EF-L models. At K. Prabhakar, we are committed to maintaining the highest standards in precision calibration and adjustments for your Sigma lenses. Our advanced test equipment includes laser-based shutter speed testers, exposure test systems, and light meter calibration units. Additionally, we utilize multiple dedicated computer-based lens adjustment workstations and high-precision optical collimators. Our custom-built lens test room allows us to conduct comprehensive optical evaluations, including tests for barrel distortion, pincushion distortion, chromatic aberration, coma, vignette, flare, sharpness, field curvature, diffraction, modulation transfer function (MTF), subjective quality factor (SQF), center-to-corner sharpness, rectilinearity, and more. For expert Sigma lens servicing and calibration, contact us, and we will gladly recommend the best course of action.