Don't feel bad Geoff, even Hubble is guilty of such diffraction effects, as seen in this narrowband? and Infra Red image below.
Different wavelengths of light (colours) diffract slightly differently around the edges of the spider/secondary support structure. You have particularly sharp focus in your image, which shows it up very clearly.
Also in addition to the diffraction above, if there is an element in the image that is close to the camera pixel spacing there can be aliasing effects/moire/false colour created
Best
JA