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Honored Contributor
Posts: 6,372
Registered: ‎08-13-2015

Re: Canon Canada to calibrate lenses?

[ Edited ]

BTW, I tested, and retested several times, my super telephoto lenses in a large, empty parking lot.  I needed a mega-sized ruler, at 50x the focal length.

The stripes on the empty parking spaces worked out very well.  If you're not getting consistent results, from one day to the next, then your testing methodology is too sloppy to draw any firm conclusions.


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