Free Lens Testing tutorial at DearSusans

Our friends on DearSusan have just published a free lens testing tutorial. It covers all the main lens aberrations and faults such as 3 types of chromatic aberration, vignetting, astigmatism, field curvature, coma, focus shift, focus breathing, distortion, spherical aberration … and tells you how to test your lenses yourself very simply. So you can buy lenses and be certain you are getting a really good deal, not buying a lemon. All the test photographs provided are made with Sony A7 cameras. Perfect before the new lens release. The link is at the bottom of this page http://www.dearsusan.net/2015/10/23/41x-mastering-the-art-of-lens-testing-free-guide/