The handbook of motion picture photography (1927)

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T Hi: HANDBOOK 0 F M oil 0 NT curved field. This residue of aberration is due to the peripheral rays, so we place before the [ens an opaque screen in which is pierced a round hole whose diameter is considerably less H C than the diameter of the lens. This is the diaphragm. In this case its purpose is t<> screen out the peripheral rays and enable US to work with the central rays only, This gives us a 28