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The D5500 CLS
Dichroic was Omega's offering of an innovative colorhead no longer based
on mechanical cams and dials. The "closed loop system" microprocessor
control provided print repeatability unmatched by other systems.
Control of the
colorhead settings was from a convenient table level controller or
translator/controller, connected to the lamphouse via a ribbon cable, with
the controllers also providing timer functions. The unit automatically
compensated for any change in color temperature, adjusting the filters to
maintain the set filtration levels. Since filtration levels were
electronically controlled, accuracy was improved compared to using the
mechanical thumbwheels on the Chromega D Dichroic colorhead. The
controllers also provided a computer interface port, the intention being
that users could control the enlarger settings from a computer using
custom software.
Used Advice:
The D5500 Dichroic system has proven both reliable and efficient. Users
have found that the benefits far outweigh any learning curve required. On
used units, the electronics should be closely examined for proper
operation. Early controllers with the membrane keypad were prone to
keyboard failure. Conversion kits are still available, but not
inexpensive. |
