ObjektiveBeurteilung Beispiel

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Objektiv Bedeutung

The standard achromatic objectives guarantee flat focus quality for 60% of your field of view.  This is actually quite a bit as the outer 40% of the area of the "pizza" has a relatively larger circumference (draw a circle on paper and see what I mean).  If you are shooting pictures through your microscope or need more than 60% of a flat field, you might choose the semi-plan or plan lenses.  Semi-plan lenses guarantee a flat field for 80% of the field of view and plan lenses (the best) are a full 100%.  These lenses are also achromats, correcting for the color dispersion effects.

Objective lenses are the lenses of a microscope closest to the object and are the most important single part of your microscope.  The quality of objective lenses varies widely from manufacturer to manufacturer and the only way to evaluate objective lenses is to physically compare one with another.  Having performed evaluations like this, we have come to the conclusion that the optics offered by National Optical, Motic and Meiji are superior in quality to other instruments found in their price range.

Subjektiv Bedeutung

The following table illustrates various sensor sizes when compared to Super 35mm film and legacy video camera sensors.

ObjektiveBeobachtung

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Special techniques must be employed to compensate for these chromatic aberrations.  First, by using two different types of glass (sandwiched into a "lens doublet") with different refractive indices, this effect can be minimized.  Lenses that employ these techniques are called "achromatic lenses ".   This simply means that they refract light with little spectral color separation.  Achromatic lenses are the most common type sold with microscopes.

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Subjektiv objektiv Unterschied

At left are a variety of objective lenses:  Achromat, Semi-Plan, Super High Contrast, and Plan (all are 100x objectives).

ObjektiveWahrnehmung Beispiel

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Some of the problems encountered with the optical characteristics of a lens are caused by the refraction of light as it passes through the lens system.  White light is really a combination of many different colors and each color refracts or "bends" at different angles when passing through a lens.  The inability of a lens to bring all of the colors into a common focus results in a slightly different image size and focal point for each predominant wavelength group. This leads to chromatic aberrations or colored fringes surrounding the image.

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Not to be confused with the term "achromatic" is the correction induced in the objective lens to adjust for focusing errors caused by field curvature.  Since a lens is curved, the sharpness of the image may be a bit off at the outer edges of your field of view.  You can, of course, refocus slightly to bring it in, but then the center part of the image will be a bit out of focus (and this is all assuming that the specimen is perfectly flat, which is not usually the case!)  Field curvature effects are most noticeable at the higher powers.  Think of the field of view as a big pizza.  At the outer edges, some of the pepperoni may look a bit fuzzy.