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That is just cos light, as much as she's particles, she is waves too, and when you squeeze waves through an opening they spread out, interfere, "smear" each other if you like. That is what scope manufacturers mean (or at least supposed to mean) by the phrase "diffraction limited". This implies that the aperture of the scope rather than the quality of the optics optics is the factor that determines the limits of its capabilities. The ED80 certainly lives up to the textbook expectations of the diffraction limit, unlike many other scopes that are promoted to do so. The fact that people have been able to push the magnification on this little scope to 150x and beyond with good results is the only proof I need (but only because I have done it and seen it for myself).
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