Manual changer
-Turrent drum type of magnification change that is rotated by hand.
-Drum holds 3 optical assemblies, for each eye.
-Two of the three assemblies are capable of providing two magnification each, one high and one low, third is an open tube blank space.
-Magnification possible:6,10,16,40,25;16.
Zoom type
Zoom type of microscopes provide an alternative to manual magnification changer
Power zoom changers avoid the momentary visual disruption or jump that occurs with the manual changer
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