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Fisheye lens of projector is a wide-angle lens that takes in an extremely wide, hemispherical image. The focal lengths of fisheye lenses depend on the film format. Fisheye lenses achieve extremely wide angles of view by forgoing a rectilinear image, opting instead for a special mapping (for example: Equisolid angle), which gives images a characteristic convex appearance. A panorama by rotating lens or stitching images (cylindrical perspective) is not a fisheye photo.
Specification of our fisheye lens as follow:
*37mm 0.42X fisheye lens;
*72mm,82mm 0.7X fisheye lens
| type | 37mm 0.42X;72mm,82mm 0.7X;0.3X |
| usage | projector,camera and so on |
| Range of diameter | Dia.0.7mm-Dia.400mm |
| Range of curve radius | R1.5-R∞ etc. |
| Tolerance of diameter | +/-0.1, +/-0.01, +/-0.005 etc. |
| Surface accuracy | λ , 1/2λ , 1/4λ , 1/10λ etc. |
| Tolerance of Thickness | +/-0.1, +/-0.05, +/-0.01 etc. |
| Centration | +/-2′, +/-1′ etc. |
| Aperture N | 5, 1 etc. |
| Irregularity ΔN | 2, 1, 0.5, 0.2 etc. |
| Surface quality | 60/40, 40/20, 20/10, 10/5 etc. |