Can Pentax make A Decent Lens? Ricoh have not fixed QC issues...

Started May 18, 2014 | Discussions thread
OpticsEngineer
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Re: Can Pentax make A Decent Lens? Ricoh have not fixed QC issues...
In reply to Joseph Tainter, May 20, 2014

"In the manufacturing process, I don't understand why it is so hard to place lens elements correctly. Can someone clarify this?"

There is some good discussion on the LenRentals website.   It explains what that what is often called decenter also includes tilt.

http://www.lensrentals.com/blog/2012/05/testing-for-a-decentered-lens-an-old-technique-gets-a-makeover

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