Dust on Lens Rear Element

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yeungp1 New Member • Posts: 1
Dust on Lens Rear Element

Hello, I recently purchased an XF 10-24mm lens from a thrift store. I couldn't believe it was there, so I went ahead and bought it. When I took a closer look at it, the front lens element was clean, but the rear element looks like it had chipped or had a speck of dust on it. I couldn't blow the dust off from the rear element, so I think the dust/chip is from inside the rear element. Should I be worried about this? I will test it on a Fuji camera soon. What testing procedure will reveal whether the speck is dangerous? Should I point it at a bright light source and close the aperture as much? Should I look at the bokeh for any dark spots? Thank you.

Dust on rear element of lens.

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