What is the disadvantage of the Debye-Scherrer film to obtain the d-spacings?

What is the disadvantage of the Debye-Scherrer film to obtain the d-spacings? Correct Answer Exposure time is long

The disadvantage of using Debye-Scherrer film method is that exposure times are long and that closely spaced arcs are not well resolved. This is because, although the incident beam enters the camera through a pinhole slit and collimator tube, the beam is somewhat divergent and the spread increases in the diffracted beams.
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