• Wider in spatial domain corresponds to narrower in the frequency domain
• We are forced to live with either low-frequency attenuation or high-frequency leakage
• Live with blur
• Infinite extent
• CRT resolution
• Only reconstruction kernel that is both linearly separable and radially symmetric

For a CRT images we basically have to live with the reconstruction filters that we are given. However, when we write an magnification program we are in control of the magnification.