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60 Relative loq 70mm film 70mm format 70mm microfilm aberrations acceptable ACHROMATISM Airy disc Altman and Phot Angstrom units APOCHROMATISM assumed axis centre characteristic curves combinations copy density detail diffraction limit discussion DOUBLE GAUSS Eastman Kodak Eight Crown electrophotographic enlarger printers exposure f number film holder flatness G.W.W. Stevens geometrical width J.H. Altman Kodak lens aperture lens designer light Line spread plots line widths lines per millimetre lines/mm Lith-type plate lithographic printing plates loq E Figure M-R plate M.R. emulsion magnification Major Fortescue map reproduction map sheets Maximum Resolution emulsion microns microscope objective miniature miniaturisation minimum MlCROFlLM modulation transfer function obtained optical Ordnance Survey original paper photographic pneumatic gauging position possible present printing on demand problem range reciprocal formula reduction factor relative intensity repro residuals resolving power result scale maps shows single colour slits stipples suggested theoretical tolerances unit line profile variation wavelength