Quote:In the reviews I see decentered lenses as faulty lenses with poor quality. Recently I discovered that this is not totally true.
I was at the repairs and was seeing how decentering is repaired:
The lens used to be mounted on a custom mount and project a chart on a wall now they just shoot a chart using live view plus HDMI projection on a screen, behind the camera mount there are a lot of screws that change position to lens elements, after adjustments any lens is back working nicely.
The bad news in Canon land this is available for all L lenses, but not all L lenses. The guy also told me centering quality is not lifelong after heavy use any lens can acquire such a defect, it is easily repaired. So having a centering defect on my 17-55 IS after ten years of use, isn't surprising.
If you have a decentetered lens this is not the end of the world especially if it is Canon L.
I know now the basics of the trick however I am not ready to do it and I prefer leaving to professionals.
Some professionals are known to exchange their lenses after a while for that reason.
The real problem started with AF lenses because the focus group has to be "lose". IS made it (much) worse.
However, some lenses cannot be recentered because they are simply not designed to be serviceable and more often than not a recentering attempt yields in sub-optimal results.
Point is also that proper recentering takes time and nobody is willing to pay that.
Klaus