On the objective, this is usually denoted by an X next to a numeric value (100X, 10X etc). On the other hand, objectives will also have a colored band around the circumference of the objective that indicates the magnification of the objective. For instance, a yellow band around the objectives (lower part of the objective) indicates that it is a 10x objective.

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The resolution of the microscope objective determines the smallest distance between two objects that can be observed. It is directly proportional to the illumination wavelength of light and inversely proportional to the NA.

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Download the brochure to learn more about the development of our Fresnel lenses, lens specifications, and details on how to order the lens you need.

Denoted by a number (such as 0.17mm) the cover slip thickness is labeled on the objective to note the type of cover slip that should be used. A cover slip changes the way light is refracted from the specimen. Therefore, it is important to ensure that the right cover slip is used in order to produce a good quality image. Zero(0) denotes no coverslip to use. Dash(-) denotes use of coverslip or no cover slip, it does not matter.

Fresnel Technologies makes a variety of stock Fresnel and related optical components to meet your needs. We can also design and construct custom Fresnel lenses and polymer optics  as requested. Our Fresnel items fall into a number of categories, but they are all made from polymer materials. Generally, our engineers design these components with thicknesses under 1/4" (6 mm) with a stepped surface.

Fresnel Technologies, Inc. specializes in the design and manufacturing of molded plastic Fresnel lenses, molded polymer optics in general, and infrared-transmitting optical materials. We offer design assistance, diamond machining, prototyping, tooling, and production. Stock or custom, we’re your optics partner.

In a finite conjugate design, the objective focuses light from the object into the focal plane of the eyepiece. An infinite corrected objective collects light from the object and forms a parallel beam that passes through a tube lens.  The advantage of this design is that additional optical elements, such as polarizers, filters, and wave-plates, can be placed in between the tube lens and the objective without interfering with the focusing of the beam. The infinite conjugate design is often used in fluorescence microscopes, which rely on filters.

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The objective depth of field is the axial range, which enables you to focus an objective without any considerable change in image sharpness. This value varies radically from low to high numerical aperture objectives; it usually decreases as the numerical aperture increases.

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It is an angle of incidence. It is the most important parameter of a microscope. NA measures its ability to gather light. It’s an important factor to determine resolution, depth of focus, and the brightness of images. Objectives with a larger NA gather a wider range of light, resulting in brighter, higher resolution images.

There are many different types of objectives available for microscopes, but without a basic understanding of how they work, it can be difficult to know which ones are best suited to the specific needs you have. That's why this article takes you through the basics points to keep in mind ,so that you'll have a better idea of what type is right for your needs.

Optical correction such as achromatic, apochromatic, plan and semi-plan are often denoted on the objective in order to show the design of the objective. Plan and semi-plan objectives correct for field curvature. Field curvature often results in blurred images on the periphery and correction for this helps produce good quality images. Whereas plan objectives correct better, allowing for better display (over 80 per cent) of field flat, semi-plain objectives produce about 65 per cent.

Today's modern computer-controlled machining methods can be used to cut the surface of each cone precisely to bring all paraxial rays into focus at exactly the same point, avoiding spherical aberration. Better still, newer optical manufacturing methods can be used to cut each refracting surface in the correct aspheric contour (rather than as a conical approximation to this contour), thus avoiding even the width of the groove (typically 0.1 to 1 mm) as a limit to the sharpness of the focus. Even though each groove or facet brings light precisely to a focus, the breaking up the wavefront by the discontinuous surface of a Fresnel lens degrades the visible image quality. Except in certain situations, Fresnel lenses are usually not recommended for imaging applications in the visible light region of the spectrum.

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Attach each objective to each lens mount hole of the revolving nosepiece, starting from the lowest magnification objective and increasing the magnification in the clockwise direction seen from the bottom. By attaching objectives in this way, the objectives can be switched in ascending order of magnification

Field of view, also abbreviated FOV, refers to how much you're able to see of a magnified sample at a specific magnification level and is displayed in distance ...

Fresnel Technologies, Inc. specializes in the design and manufacturing of molded plastic Fresnel lenses, molded polymer optics in general, and infrared-transmitting optical materials. We offer design assistance, diamond machining, prototyping, tooling, and production. Stock or custom, we’re your optics partner.

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Is the distance from the objective’s front lens to the closest surface of the coverslip when the specimen is in focus? WD is inversely proportional to the NA, which means that higher NA objectives typically have low working distances.

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The higher the NA, the smaller the distance between two objects. As we mentioned previously, choosing the right NA for your application is crucial in determining the resolution of your microscope system.

Each objective and eyepiece has a specific purpose or function. Objective lenses magnify the image that enters the objective and bring it to a sharp, clear focus. Eyepieces take the light that has been focused by the objective lenses and magnify it further so that you can see it. The magnification power is measured by objective magnification multiplied by eyepiece magnification.

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NA is also important to observe very fine structures or detect dim signals during fluorescence observation. When determining which microscope objective will resolve the smallest feature in your specimen, think about the NA. As you weigh your options, keep in mind that numerical aperture typically ranges between 0.10 to 1.25.

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Fresnel Technologies, Inc. specializes in the design and manufacturing of molded plastic Fresnel lenses, molded polymer optics in general, and infrared-transmitting optical materials. We offer design assistance, diamond machining, prototyping, tooling, and production. Stock or custom, we’re your optics partner.