Chapter 3: BD CARV II Touch Pad Controller
43
Figure 3-6
Intensity Iris Screen
The CARV II has two memory locations for the size of the variable intensity iris;
one for when the confocal disk is in the light path, and one for when the disk is
out. Each location is independently set and either one can be larger than the other
or both can be equal. The intention of the two memorized sizes is to allow
intensity compensation by the iris for the light reduction caused by the confocal
disk. Therefore, the factory defaults are set to have the variable intensity iris fully
open when the confocal disk is in the light path and fully closed when the disk is
out. Note that the variable intensity iris does not block all the light when it is
fully closed.
Whether using computer commands or the touch pad, only the size at the current
position of the intensity iris can be adjusted. As a result, commands to change the
setting of the variable intensity iris when the confocal disk is in the light path will
only change the size of the iris in that position. The confocal disk has to be
moved out of the light path to change the size of the intensity iris for that
position. In this way, when the confocal disk is moved in and out of the light
path, the variable intensity iris automatically changes between the two
memorized sizes.