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2. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   The maximum angular magnification (compared to the naked eye) of a magnifying glass depends on how the glass and the object are held, relative to the eye. If the lens is held at a distance from the object such that its front focal point is on the object being viewed, the relaxed eye (focused to infinity) can view the image with angular ...

3. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   The eye can then be a larger distance away, and a good image can be obtained very easily; the focus is not very sensitive to the eye's exact position. The magnifying power in this case is roughly MP = (0.25 m)Φ. A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres. Such a magnifier ...

4. Coddington magnifier - Wikipedia

   en.wikipedia.org/wiki/Coddington_magnifier

   A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...

5. Eyepiece - Wikipedia

   en.wikipedia.org/wiki/Eyepiece

   2.7 inch (68.58 mm) – 2.7″ eyepieces are only made by a few manufacturers. They allow for slightly larger fields of view. Many high-end focusers now accept these eyepieces. 3 inch (76.2 mm) – The even larger barrel size in 3″ eyepieces allows for extreme focal lengths and over 120° field of view eyepieces. The disadvantages are that ...

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7. High-power field - Wikipedia

   en.wikipedia.org/wiki/High-power_field

   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]