World's largest lens
The world's largest civilian photographic lens
![Sectional view of the world's largest civilian photographic lens. Only the lenses from Zeiss. everything else from CEMEC.](/site/assets/files/1172/apo-sonnar-01.600x0.jpg.pagespeed.ce.pfbiLSpaIy.jpg)
APO - Sonnar 4/1700 T*
The lens project was a partnership with Zeiss-Oberkochen.
Concept
CEMEC developed the mechanical concept, completed all mechanical design work and built the lens. The only specifications where the optical calculations provided by Zeiss-Oberkochen.Static modelling and design of the structure, thermal modelling of the lenses and the high requirements with regard to accuracy led to a mechanical design which had never been implemented before. Even the lens mounts were implemented with new, innovative technology developed by us.
Structure
![Representation of the FEM structure calculation of the lens.](/site/assets/files/1172/fem-berechnung-objektiv.600x0.jpg)
Representation of the FEM structure calculation of the lens
The structures CTE consciously is different in X- and Y-axis compared to the Z-axis. The structure is manufactured better 20 µm. Form fit for lenses is better 10 µm. Lenses adjustable down to µm.
Special features
The focus and temperature compensation drives provide µm-accuracy positioning. Passive temperature compensation was implemented for every individual lens in the system.The lens is operated and controlled via a touch screen using firm- and software developed in house. Manufacturing of the individual lenses, assembly of the optics and final calibration were performed by Zeiss Oberkochen after the finished structure was delivered.
Tripod
![Finished lens together with the Statif. Smoothly rotate, tilt, lift 254 kg lens weight.](/site/assets/files/1172/objektiv-stativ.600x0.png)
Finished lens together with the tripod – smoothly rotation, tilt, lift 254 kg lens weight
For this lens, CEMEC developed a custom tripod which can be controlled in all 3 degrees of freedom using two trackballs located on the lens.
Technical Data
Total length: | 2000 mm | With lens hood |
---|---|---|
Diameter: | 630 mm | Outer shell |
Weight: | 256 kg | Lens without tripod |
Focal length: | 1700 mm | Fixed focal length |
Luminous intensity: | 4 | F-stops from 4-32 |
Main lens: | 420 mm | Diameter |
Focus travel: | 230 mm | equivalent of 35m to ∞ |
Magnification: | 21 - times | Angle of view approx. 2.3° |
Connection: | Hasselblad | Digital 6x6 |