Sofisticated Tokina's designing and manufacturing technologies are incorporated with compact and light weight body.
Superapochromat using the SD glass
Expensive super low dispersion glass which has been used for TV Broadcast lenses is used in the frontal part of the lens to eliminate in an ideal manner the secondary aberration occurring at the telephoto side.
SD(Super Low Dispersion)GLASS
NORMAL GLASS |
secondary spectrum |
SD GLASS |
secondary spectrum |
Employment of the internal cam system
The system allows the cam grooves to be cut by an easier gradient. This will permit at the same time the strength of the cam barrel to be increased relative to that of the conventional system. An increase of precision in the direction of the optical axis has made it possible for an ideal optical performance to be achieved at a value almost identical with that of the design. With a decrease of the load to the zooming and focusing motors, the overall durability has signifi cantly enhanced.
Remote extender
Tokina employed the extender system which has been used for TV broadcast zoom lenses in contrast to conventional extenders attached to the rear end of a lens, this extender has been incorpora ted into its optical system itself from the designing stage to ensure that an opti mal extender most appropriate for the lens should be developed. Moreover, use of a motorized system for moving of the extender has allowed it to be remote ly controlled.
Internal cam | Normal cam |
Triplet compensator
High resolution suitable for 3CCD cameras
The progress in the use of 3CCD cam eras is remarkable in recent years. Pro vided with a high resolving power, the lens will allow you to fully utilize the cam era's performance to obtain images in bright colors with high resolution.
Tokina has solved the problem of a deterioration of the center performance at around halfway of the zooming range with this compensator. The deterioration is a characteristic commonly observed in telescopic lenses with a high magnifying power. A result of the Tokina's advanced optical technologies, the compensator prevents the deterioration from occurring and achieves a high resolution over the entire zooming range.
MTF (Modulation Transfer Function)
TM50Z1040 (10-500mm 1: 4.0)
| 100 |
Response(%) | 50 |
| 0 |
0
Saggital(f=10mm)
Meridional(f=10mm)
Saggital(f=250mm)
Meridional(f=250mm)
Saggital(f=500mm)
Meridional(f=500mm)
24.2 Image Height(mm)