File:HartmannShack 1lenslet.svg Tilt File:Spherical aberration 3.svg Spherical aberration File:Astigmatism.svg Astigmatism File:Lens coma.svg Coma File:Barrel distortion.svg Distortion File:Field curvature.svg Petzval field curvature File:Chromatic aberration lens diagram.svg Chromatic aberration