Objective lens
l Focal length of this lens determines the distance between the lens and the operating field
l Lenses in the range of 200-400mm is recommended for dentistry
l A 200mm focal lens focuses at about 8 inches
Importance of objective lens
determination of magnification
determination of working distance
Illuminating systems
l Illumination near the optical axis is called co-axial lighting
l Coaxial lighting provides homogeneous illuminated field that is concentric with the field of view
l Light system includes
Light supply
Transmission guide
Focusing lens
Light supply
Mounted in the body/remote location
Moderate intensity-6v,30W tungsten
High intensity-12v,100W,halogen quartz
A suction cooling system containing a blower assembly mounted on the microscope lamp housing is needed to reduce the heat.
Accessory metal halide light source offers higher output
Xenon halogen bulb is recommended as compared to quartz, as it provides a brighter and warmer light.
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