As object spatial frequencies increase, how does MTF change?

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Multiple Choice

As object spatial frequencies increase, how does MTF change?

Explanation:
MTF shows how much image contrast is preserved at different spatial frequencies. When you move to higher spatial frequencies, which correspond to finer detail, the optical system—through blur, diffraction, and any aberrations—smears those fine patterns and reduces their contrast. So the transmitted modulation drops as frequency increases. In an ideal system, MTF would start near 1 at zero frequency and then fall off with frequency; in real systems it begins below 1 and continues toward zero as you approach the resolving limit. Hence, as object spatial frequencies rise, the MTF decreases.

MTF shows how much image contrast is preserved at different spatial frequencies. When you move to higher spatial frequencies, which correspond to finer detail, the optical system—through blur, diffraction, and any aberrations—smears those fine patterns and reduces their contrast. So the transmitted modulation drops as frequency increases. In an ideal system, MTF would start near 1 at zero frequency and then fall off with frequency; in real systems it begins below 1 and continues toward zero as you approach the resolving limit. Hence, as object spatial frequencies rise, the MTF decreases.

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