"Celestron 44104, The Celestron Advanced Biological Microscope 500 is an intermediate level biological microscope that provides advanced features
It is equipped with electric illuminator that provides direct control of light. The Celestron Advanced Biological Microscope 500 is has Abbe condenser and Iris diaphragm which are supplied to concentrate and adjust the illumination. A mechanical stage is standard equipment with knobs controlling both axes for easy centering of specimen slides. 44104 Features: Product # 44104, Advanced Biological Microscope 500, 500x Power Biological Microscope, Abbe Condenser, Precision all-metal Body, Fully Coated Glass Optics, Electric Illuminator, Monocular Head, Five Prepared Slides, Iris Diaphragm, Mechanical Stage, Coarse & Fine Focus Knobs, Specifications: Magnification: 40x, 50x, 100x, 125x, 400x & 500x, Eyepiece: 10x & 12.5x, Objective Lenses: 4x, 10x, 40x, Objective Nosepiece: Triple, DIN: 185 mm (7.28 in), Condenser Lens: Abbe N.A. 1.25, Illumination: 50 mm (2"") Mirror & LED Electrical, Filters: Blue Filter, Microscope Head: Monocular, Adjustable 0° to 60°, Eyepiece F.O.V.: 12 degrees, Stage: Mechanical, 115 mm x 125 mm (4.5"" x 4.9"")"