>>3922253The problem is that, even after you spend money and time trying to calibrate lenses with this thing, it will probably only work 30-40% of the time, because there are ”focus inconsistencies” (and also slightly worse IQ) that you’ll get, if your copy is bad.
The bad copy thing is so bad, that people in US apparently keep returning their lenses constantly (and some store had to set limit to 5 times before they decline), until they get a sample that A) Wasn't bad out from the factory, or B) Didn't become bad during shipping.
https://www.dpreview.com/opinion/6856813208/roger-cicala-the-difference-between-sample-variation-and-bad-copies-part-1Like I get it, when you pay 200-400 USD, it's not that important, and especially on lower focal length primes (50mm), even a bad sample should perform relatively well. But as soon as we're talking bigger dollarinos, bigger focal lenghts (85mm f1.8 and upper), and zoom lenses in particular, the losses you get from having a "bad sample" (be it due shipping, or bad from factory), start to accumulate heavily. I don't think I have the nerve to do what other people do, which is keep returning a lens until I get what I paid for, but because I don't do that, I also get the feeling I'm getting "robbed" by these companies, whom don't seem to have tight enough "tolerances" set, which is why most of these products don’t match the expectations set to them, which is precisely why D800 Nikon had the "famous" left focus point issue.
