Camera lens indeed has sophisticated mechanical parts. As other mechanical devices, lubrication is an essential treatment. However it doesn't mean that a lens needs lubrication.
Here is a severe example of the impact of a drop of oil on the aperture. The aperture mechanism is using a very light force. Therefore a small inhibitor will affect its functionality. The aperture blade is so light and designed with such kind of matte surface, apparently to prevent any glare. Therefore the oil fill the matte texture of the blade, and the cohesive forces between blades increase, so they are harder to move. Finally the diafragm cannot be changed.
I wonder from where did the oil come from? Apparently it came from the melting grease. But still I'm unsure, it may also came from silly human action.
Here is a severe example of the impact of a drop of oil on the aperture. The aperture mechanism is using a very light force. Therefore a small inhibitor will affect its functionality. The aperture blade is so light and designed with such kind of matte surface, apparently to prevent any glare. Therefore the oil fill the matte texture of the blade, and the cohesive forces between blades increase, so they are harder to move. Finally the diafragm cannot be changed.
I wonder from where did the oil come from? Apparently it came from the melting grease. But still I'm unsure, it may also came from silly human action.
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