Imaging recource: The perfect lens doesn’t exist and getting close to perfect is expensive

Many of us only have the opportunity to use one copy of any particular lens. It isn't practical for the end-user to test different versions of the same lens before settling on one, nor is it good for retailers if consumers are cycling through lenses. Supposing that you had the equipment to accurately test your lenses (which you probably don't), your own lens will never be as good as the theoretical MTF that the manufacturer publishes. As LensRentals founder and co-owner Roger Cicala says in his post on LensRentals, "Perfect doesn't exist. For $20,000 and up...
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