Carl Zeiss Camera Lens - Manual (Page 5)

Sharp Max
Carl Zeiss
Camera Lens Division
Bedienungsanleitung Sharp Max 12_02E.doc Status 12 / 2002 Page 5 of 11
2 Description of the unit
2.1 General
In digital cameras with a B4 mount, the distance between the mechanical interface
(bayonet) and the CCD chip of the camera is not clearly defined. For this reason, the
back focus of the lens can be varied to allow every lens to be adapted to the camera
used.
Sharp Max is used to adjust this back focus of Carl Zeiss Digi Prime lenses.
A sturdy design, easy operation and high accuracy are the hallmarks of this unit. This
provides the user with the following benefits:
• Due to an athermal design, the factory adjustment is maintained over a wide
range of temperatures.
• No additional aids such as illumination systems, a Siemens star printed on
carton, or a tape measure are needed to adjust the back focus.
• High adjustment accuracy, little time needed
For this reason, Sharp Max is particularly suitable for use by service staff and in the field
during film productions.
The unit is comprised of the following main modules:
• Basic body with collimator lens, Siemens star, illumination system, battery
compartment and controls
• Interchangeable lens flange
The basic configuration of the unit allows the lenses of the Carl Zeiss Digi Prime line to
be tested. With different lens flanges, lenses supplied by other manufacturers can also
be tested.
2.2 Principle of operation
A collimator lens exactly images a Siemens star illuminated by LEDs at infinity. The lens
under test whose focusing ring has been set to infinity projects the image of the
Siemens star onto the CCD chip. This Siemens star can be viewed through the camera's
viewfinder and focused using the back focus ring of the lens.