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2. High-power field - Wikipedia

   en.wikipedia.org/wiki/High-power_field

   A high-power field (HPF), when used in relation to microscopy, references the field of view under the maximum magnification power of the objective being used. Often, this represents a 400-fold magnification when referenced in scientific papers.

3. Oil immersion - Wikipedia

   en.wikipedia.org/wiki/Oil_immersion

   Oil immersion objectives are used only at very large magnifications that require high resolving power. Objectives with high power magnification have short focal lengths, facilitating the use of oil. The oil is applied to the specimen (conventional microscope), and the stage is raised, immersing the objective in oil.

4. Objective (optics) - Wikipedia

   en.wikipedia.org/wiki/Objective_(optics)

   Two Leica oil immersion microscope objective lenses; left 100×, right 40×. The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes ...

5. Optical microscope - Wikipedia

   en.wikipedia.org/wiki/Optical_microscope

   The actual power or magnification of a compound optical microscope is the product of the powers of the eyepiece and the objective lens. For example a 10x eyepiece magnification and a 100x objective lens magnification gives a total magnification of 1,000×.

6. Field of view - Wikipedia

   en.wikipedia.org/wiki/Field_of_view

   In microscopy, the field of view in high power (usually a 400-fold magnification when referenced in scientific papers) is called a high-power field, and is used as a reference point for various classification schemes. For an objective with magnification , the FOV is related to the Field Number (FN) by

7. Water immersion objective - Wikipedia

   en.wikipedia.org/wiki/Water_immersion_objective

   Objectives with high power magnification have short focal lengths, facilitating the use of water. The water is applied to the specimen (conventional microscope), and the stage is raised, immersing the objective in water. Sometimes with water dipping objectives, the objective is directly immersed in the solution of water which contains the ...