| 摘要 |
Imaging or projection lenses (10) of small size and excellent perormance are disclosed. Either triplet or doublet in form, the lenses include aspheric (12a, 12b, 14a, 14b, 16b) and diffractive surfaces (14b), the diffractive surfaces being formed on selected ones of the aspheric surfaces. The fastest F/numbers of the lenses are from about 1.8 to about 1.9, and the diffractive surfaces are placed next adjacent to the aperture stops of the systems to allow for maximum correction of the axial chromatic aberrations with minimum effect on the lateral chromatic corrections.
|
