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The eyepiece is inserted into the top end of the body tube. Eyepieces are interchangeable and many different eyepieces can be inserted with different degrees of magnification. Typical magnification values for eyepieces include 5×, 10× (the most common), 15× and 20×.
The field of view seen through an eyepiece varies, depending on the magnification achieved when connected to a particular telescope or microscope, and also on properties of the eyepiece itself. Eyepieces are differentiated by their field stop , which is the narrowest aperture that light entering the eyepiece must pass through to reach the field ...
One of the most important properties of microscope objectives is their magnification.The magnification typically ranges from 4× to 100×. It is combined with the magnification of the eyepiece to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object.
By convention, for magnifying glasses and optical microscopes, where the size of the object is a linear dimension and the apparent size is an angle, the magnification is the ratio between the apparent (angular) size as seen in the eyepiece and the angular size of the object when placed at the conventional closest distance of distinct vision: 25 ...
Some stereo microscopes can deliver a useful magnification up to 100×, comparable to a 10× objective and 10× eyepiece in a normal compound microscope, although the magnification is often much lower. This is around one tenth the useful resolution of a normal compound optical microscope.
Area per high-power field for some microscope types: Olympus BX50, BX40 or BH2 or AO: 0.096 mm 2 [1] AO with 10x eyepiece: 0.12 mm 2 [1] Olympus with 10x eyepiece: 0.16 mm 2 [1] Nikon Eclipse E400 with 10x eyepiece and 40x objective: 0.25mm 2 [2] Leitz Ortholux: 0.27 mm 2 [1] Leitz Diaplan: 0.31 mm 2 [1]