An array of high intensity light emmitting doides (LEDs) within the CAM1 lens provides the illumination for the iaging of the capillaries. The brightness of the LED array is adjusted by the knob on the front panel of the CapiScope PU.
It is usually best to adjust the CapiScope video input settings first. (See Video input control). Set the gain to 1.0, and the brightness and contrast to midpoint.
If you adjust the LEd brightness level when looking at the skin surface, then apply oil, you will then need to increase the LED brightness. Usually, once set the LED brightness doesnt need to be adjusted very often, you might find sing the Video input control easier.
Pigmented tissues will need consideral higher LED brightness levels.
If the LED brightness level is too high, then the CCD will become saturated. Adjusting the Video Input Control will just change the grey level of the saturated image. i.e. you will get flat areas with no detail and adjusting the Video Input Control brightness will just make the flat area darker. In this case you will need to lower the LED brightness.
If the LED brightness is too low and you compensate by increasing the Video Input Control brightness and/or contrast, then the image will be noisier (grainier) than it needs to be. Also the CAM1 laser spot will appear brighter than it needs to.