Cinemascope made which of the following cinema techniques difficult if not impossible?

Question

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Cinemascope, with its anamorphic lens system designed to shoot widescreen images, made several cinematography techniques challenging. Close-ups could appear distorted, deep focus was harder to achieve due to the optics and wider aperture requirements, and maintaining a wide depth of field was difficult because of the need for more light and the optical characteristics of the anamorphic lenses.

Cinemascope Made Which of the Following Cinema Techniques Difficult If