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Message: <blockquote data-quote="etudiant" data-source="post: 3178492" data-attributes="member: 48052">The answer is more transparency.It is not neither difficult nor expensive to provide the performance sheet for each glass. Light transmission and MFT can be provided individually at little extra expense. Objective documentation is pretty hard to refute. It could be the core of the marketing campaign, 'We build them just for you', which is what Maven is currently offering on an attenuated basis. Lens Rentals (<a href="http://www.lensrentals.com" target="_blank">http://www.lensrentals.com</a>) is a business which leases out camera lenses. They also repair them and have developed the tools to help them monitor and measure the results. They do this routinely, on thousands of lenses, so the economics cannot be prohibitive.Incidentally, the founder of Lens Rentals, Roger Cicala, writes a superb blogwhich details the ins and outs of lens optics. Great reading and often very informative.  (<a href="http://www.lensrentals.com/blog" target="_blank">http://www.lensrentals.com/blog</a>)</blockquote>