User Manual

Table Of Contents

Typically, a lens will start-up at a baud rate of 115k2 and send the powerup string,

<[l/f][c/r/], (less-than symbol followed by a linefeed and carriage return), when power is

detected. The lens will then wait for one second to receive an N command from a

controlling channel. If the N command is not received within one second, the baud rate

will drop to 9600 and the lens will wait until an N command is received. The lens must

receive an N command as the first command. Once the lens has received and

responded to the N command, all other commands (valid for that lens type) are

available to the controlling channel(s). For example, the Kbn command can be sent to

the lens to revise the baud rate.

4.2.1 Connecting an/I Lens to an I Camera

Film and digital cameras which are I Technology compliant can automatically

retrieve and record key lens data for each frame through the four contact pins built into

the PL mounts. The extent of camera data made available is the choice of the camera

manufacturer via their software, so check with the camera manufacturer for details.

Cameras use different film sizes or Circle of Confusion values. The lens’ default film size

is 35 mm with Circle of Confusion value equal to 0.0250 mm. You can use the V, W or

Wnn command to set the appropriate film size to match any camera. See Section 5.15 –

5.17 for details.

4.2.2 External Remote Readout of/I Lens Data

Continuous remote readout of the precise lens data can be obtained by connecting

the lens to an external device such as the Cinematography Electronics I Lens Display

Unit. Lens data can be displayed on an externally connected/I compatible monitor,

such as Transvideo’s CineMonitorHD.

4.3 Viewer Software for Cooke I Lenses

The Cooke Viewer program can be used to display lens data through its external

interface. The program runs on a Windows or MAC OS X platform and can be

downloaded from the Cooke Optics website at:

http://www.cookeoptics.com/cooke.nsf/technical/downloads.html

The lens is connected to the PC or MAC through a serial port. If the computer does

not have a serial port, use a USB-Serial port adapter and install the correct driver.

A Java Runtime Environment (JRE) is required to run the program. If it is not already

installed on your computer, it can be downloaded for free from www.java.com.

See Appendix C.2 for additional details on how to use the Viewer Software.