Spiderweb in the ED80

While processing some frames of The Pleiades I noticed a strange diffraction pattern on the brighter stars. Further investigation was called for so I brought my ED80 in from the observatory and looked it over with a bright flashlight. See what I found...
 
This close-up of Pleione and Atlas shows the unusual diffraction pattern.
Here you can barely see the web stretched across the lower left on the inside of the OTA.
A close-up of the web. It appears to be un-inhabited!

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