| Popis: |
To meet the requirement of market,a short focal digital projection lens for 0.8 inch digital light processing(DLP) projectors is designed.The total length is 172.6 mm,and the full aperture is 70 mm.The lens uses a retrofocus structure,and it is composed of six glass lenses and one plastic lens(two even aspheric surfaces).Its FOV is 80°,F-number is 2.1,retrofocus proportion is 3.17∶1,and projection ratio is 0.76∶1.Its MTF in all field is less than 28° that is higher than 0.6 at the limiting spatial frequency of 37 lp/mm.The lateral color is less than 3.5 μm.The distortion of the full of view is less than 1.1%.Its image quality is excellent with advantages of simple structure,small size,easy process and low cost. |
