| 摘要 |
A movie projection lens (40) for forming an image over the visible spectrum, at high magnification is disclosed. The movie projection lens (40) comprises in order, from a movie screen (62) side of the movie projection lens (40) a diffractive lens (42) with negative power, followed by a group (45) of positive (43) and negative (44) refractive lens elements with overall negative power. A diffractive lens (33) with positive power is followed by a group (46) of positive (43) and negative (44) refractive lens elements with overall positive power. The positive refractive group (46) is located adjacent to film (64) The positive power diffractive lens (33) has minimal affect on lateral chromatic aberration. The negative power diffractive lens (42) affects both lateral and axial chromatic aberration and has a greater affect on lateral aberration than on axial aberration.
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