The 135 f2 is a wonderful, sharp, high performing lens, but when a student emailed me asking about all this crazy purple and green fringing going on and asking if it was normal, I assumed he had shot it wide open. He hadn't, it was stooped down to f3.5 and reported that as he continued to stop down still saw . All lenses have a degree of CA or Chromatic Abberation, its something typically we see in areas of high contrast. Many cameras have software to clean this up automatically, so we may not see it, and there are also ways to clean it up in post.
Michael's Canon 90D Facebook User Group
Michael's Canon 90D Crash Course Training Tutorial
Michael’s Intro Camera Tutorial Videos
MAVEN Filters, Mini Microphone
Michael’s Maven Straps
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