The aerosol modulation transfer function (MTF) describes blurring deriving from light scatter caused by aerosols. Little
scintillations or image dancing are involved. When overall atmospheric point spread function (PSF) is analyzed for its
turbulence component deriving from angle-of-arrival fluctuations or scintillations, a significant portion of the PSF is left
over. This is the aerosol component. This overview describes the basic physical mechanisms for aerosol MTF and its
wavelength, weather, and time exposure dependences, as well as a comparison to turbulence MiT.