Imaging recource: Why is there a fly in my @#$%

Longtime photographers will likely know the pain of seeing specks of dust inside an expensive lens. It can be frustrating, surely, but as Roger Cicala points out in a new blog post, dust is very unlikely to affect image quality. However, Lensrentals recently had a Canon 70-200mm f/2.8 IS II lens (a weather-sealed lens, no less) return from a rental not with dust, but rather, with a fly inside. If dust doesn't impact image quality, will a fly? As you might expect, removing a fly from a lens is a tricky task. As Cicala remarks, "If...
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