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The $48 million Barrington, NJ-based Edmund Optics is retaining its core title, business-to-business catalog Edmund Industrial Optics. “The growth rates were faster on our optical b-to-b business,” says Nicole Edmund, vice president of marketing. “So with a limited amount of resources, we wanted to stick with what was giving us our greatest return.”
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B-TO-B A BETTER BET Until the early 1980s, Edmund Scientific had been the cataloger’s flagship book. But during the past 20 years, Edmund Optics de-emphasized it in favor of its Edmund Industrial Optics catalog, which sells optical and imaging component solutions to semiconductor, telecommunication, and medical professionals. Whereas Edmund Scientific accounted for 75%-80% of the company’s sales in 1980-81, by this year it accounted for only 20% of overall sales.
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Edmund Scientific, which targets some educators in addition to hobbyists, will retain its name under the $50 million SK. “The Edmund Scientific name has a lot of history,” says Randy Burkard, president of Tonawanda, NY-based SK.
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“The Scientific side of the business needed the leadership and entrepreneurial spirit to take it to the next level,” Edmund says. “That’s why we think VWR was a good fit.”
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Four years after putting Edmund Scientific on the selling block, Edmund Optics has sold the $10 million science hobbyists catalog to Science Kit & Boreal Laboratories (SK), a division of $1.46 billion laboratory supplies cataloger VWR Scientific Products. Terms were not disclosed.
Burkard says his company plans to share an as yet undetermined number of Edmund products with three SK catalogs that mail to teachers. At the same time, some items from the existing SK catalogs will be added to the Edmund book. But the company does not plan to mail Edmund books to the SK lists or SK books to the Edmund house file.
The depth of focus (DOF) or the focal depth is the range of distances for which the specimen (object) is imaged with an acceptable sharpness on the image plane. DOF is larger as the opening (aperture) angle of the incident probe is smaller but is smaller as the magnification of the image is higher. The opening angle of the incident electron probe of the SEM is about 100 times smaller than that of the optical microscope. Thus, the DOF of the SEM is about 100 times larger than that of the optical microscope. Fig. 1 schematically shows the change in DOF when the diameter of the objective lens aperture is changed. Fig. 2 shows a comparison of SEM images taken at the different DOFs determined by the different objective lens aperture sizes.
In der Makrofotografie wird ein Objekt so vor der Kamera positioniert, dass es auf der Aufnahme sehr groß und detailliert wiedergegeben wird.