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Forum: Troubleshooting and Beginner Help
01-16-2018, 03:59 PM
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It looks like a classical case of "Newton's Rings" named after the famous English physicist Isaac Newton. It occurs when a curve optical surface touches a flat glass surface causing a varying circular space between the two. Light passing through causes optical interference patterns that take the form of concentric rings. I think that lens element separation moves the two surfaces into close contact causing the ring pattern. Exactly how this happens I don't know. It will depend on the final placement of the individual glass elements after lens separation occurs. Google Newton's rings to learn more.
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