Thanks Klaus, this thread saved me from buying a decentered lens yesterday
Do-it-yourself centering sanity check
Posted 01 October 2016 - 03:21 PM
Around 2004 I purchased a Canon 70-200mm 4:0 lens. It had serious decentering problems, so I send it to the official Canon repair centre in the Netherlands. The lens was returned within a fortnight or so with a letter saying the lens was fine, it was all with in the margings. But the lens gave a terrible decentering at the long end. For certain kind of images the lens was fine, but for others it was terrible and I hated the lens. One day I dropped it accidently. Front lens element was broken. I send it to the repair center, I got it back with a scratch on the new glass element and there was considerable room within the zoom. So, I sent it back again and they fixed it.
And to my suprise the decentering was gone! Not the first time I got disappointed by the Dutch Canon repair center and not the last. But now I can use this image in the future for an easy check up.
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