Originally posted by robert I can see your point and thats a smart thing to do but should we really have to? Should I have to drive 3 different cars to find one that's not defective? Shouldn't these lenses be tested before they are put out to be sold?
I've written before about this.
Roger Cicala, the owner of Lens Rentals, understands this better than nearly anyone out there. He always tests ten or more copies because of modern quality control, which consists of getting it roughly right, then putting it out there to the distributors. He would never do what you did, say everyone else's lens was as bad as yours. You even refused to believe it when I showed you the other owners' thread, saying something along the lines that somehow the resolution they were posting at was hiding their true performance!
Rather than pay for a final step of QC, it's cheaper on a whole for the companies,
and cheaper on a whole for us consumers, if we do the final step and send back something as a return.
And yes, he's documented the variation in Canon L Series lenses. Are you aware of those? They're the top of the line in that brand.