The E-330 uses Olympus' patented Supersonic Wave Filter dust reduction system to shake dust from the sensor during startup and when requested by the user; this largely eliminates the problem of dust accumulation on the surface of the image sensor.
ðɪ ˈiː θɹˈiːhˈʌndɹɪd θˈɜːɾi jˈuːsᵻz əlˈɪmpəs pˈæʔn̩ɾᵻd sˈuːpɚsˈɑːnɪk wˈeɪv fˈɪltɚ dˈʌst ɹᵻdˈʌkʃən sˈɪstəm tə ʃˈeɪk dˈʌst fɹʌmðə sˈɛnsɚ dˈʊɹɹɪŋ stˈɑːɹɾʌp ænd wɛn ɹᵻkwˈɛstᵻd baɪ ðə jˈuːzɚ; ðɪs lˈɑːɹdʒli ᵻlˈɪmᵻnˌeɪts ðə pɹˈɑːbləm ʌv dˈʌst ɐkjˌuːmjʊlˈeɪʃən ɔnðə sˈɜːfɪs ʌvðɪ ˈɪmɪdʒ sˈɛnsɚ.