Originally Posted by rekbones
Looks like some fibers inside the optics. Adjust the focus and see if it comes into focus.
If it is, a trick that once worked for me on an old projector was to run it on High Altitude Mode for a while - which blew it out.
BenQ HT2050 Projector; Kodi (on Ubuntu, OpenELEC & S802) via Sony STR-DH540 AVR with Boston Acoustics SoundWare XS SE 5.1 Audio + Jamo 210 Sub. Emby for Mobile Streaming.
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