This beautiful pattern i've found in a old Canon lens is a phenomenon called balsam separation. Some lens elements are glued together with canada balsam, which is a kind of totally transparent
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Fungus or balsam separation?
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Lens Fungus. | ePHOTOzine
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Canon FL 50mm F1.8 II (JT Full Overhaul) 1 - BALSAM SEPARATED - JPY3,000 : Japan-Tool Online Shopping Cart
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One way to fix lens separation
Angry Photographer: What is lens BALSAM SEPARATION? What it looks like and does - YouTube
Re: Fungus or Balsam separation?: Sony Alpha SLR/SLT A-mount Talk Forum: Digital Photography Review
