"After we published a number of posts about copy-to-copy variation, people were quick to say that this company or that needs to 'just' improve quality control. I totally agree but realize most people don’t have a clue what ‘improving quality control’ would really look like. I think they have some vague idea of hiring a guy named Joe to sit at the end of the assembly line, check all the lenses, and reject all the bad ones. Optical quality control for lenses is way, way more complicated than that."Check out the LensRentals Blog for more info.
"Possibly cross-polarized (polarizing filter on lighting, polarizing filter on lens, set at right angles to each other to eliminate the facing-forward reflections).Indeed, she is right. I first opened up a blank / white document in Photoshop giving me a large blank white background via the laptop's WLED screen. The clear plastic jar was placed on a black laminate board on top of my laptop's keyboard (I used a couple of books to raise the height a bit).
Clue - rainbow stress marks on the plastic."
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