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Polarizing microscope uses transmitted light and a polarizing unit to view thin sections of minerals, polymers, crystals, and particulates, and has a Bertrand lens for viewing conoscopic images
Trinocular viewing configuration with a sliding binocular head that has a pair of 18mm 10x widefield eyepieces and fixed inclination to reduce eye and neck strain, and a 23.2mm trinocular port that accepts a camera adapter (sold separately)
Forward-facing nosepiece with 4x, 10x, and 40x strain-free achromatic objectives that minimize distortion and provide color correction
Lower polarizing illumination enhances contrast, and a halogen light source with rheostat, Abbe condenser, and iris diaphragm provides clear examination and light control
Round stage rotates to position specimens, and coaxial nested coarse and fine focus knobs speed focusing
The BestScope BS-5060T Polarizing Trinocular Compound Microscope has a pair of 10x widefield eyepieces (one with crosshair scale), a Bertrand lens, a 23.2mm trinocular port, a forward-facing nosepiece with three strain-free achromatic objectives, transmitted halogen illumination, coaxial nested coarse and fine focus, an Abbe condenser with iris diaphragm, and a rotating round stage. The built-in Bertrand lens enables viewing of conoscopic images (interference figures). The trinocular viewing head has a binocular head with a pair of eyepieces that slide to adjust interpupillary distance, fixed inclination to reduce eye and neck strain, and 360-degree rotation capability to provide a more comprehensive view and enable sharing; and a trinocular port that accepts a camera adapter (sold separately). A forward-facing nosepiece eases changing objectives. Strain-free objectives minimize distortion. Achromatic objectives provide color correction of magnified images. A transmitted polarizing microscope uses transmitted light and a polarizing unit to enhance contrast for viewing thin sections of minerals, polymers, crystals, and particulates in geological, metallurgical, chemical, pharmaceutical, and industrial applications.
The microscope has lower (diascopic) illumination that transmits light up through the specimen for enhanced visibility of translucent and transparent objects. It has a rotatable analyzer and a polarizer that can slide into and out of the optical path. The halogen light source provides bright light in a concentrated path, and a rheostat controls the amount of light emanating from the lamp. The Abbe condenser can be adjusted to control the distance of the light from the stage, and has an iris diaphragm to optimize the amount of light illuminating the specimen. The round stage rotates to position specimens, and is graduated in 1-degree increments. Coaxial coarse and fine focus knobs are nested to speed focusing for left-and right-handed viewers.
Microscope Head and Optics Specifications
Binocular head inclination
WF10x, WF10x with crosshair scale
Objectives, strain-free achromatic
4x, 10x, 40x
Microscope Illumination and Stage Specifications
Coaxial coarse and fine
Halogen with rheostat, 6V/20W
Microscopes are instruments used to enhance the resolution of an object or image. Types include compound, stereo, or digital. Compound microscopes use a compound optical system with an objective lens and an eyepiece. Stereo microscopes show object depth in a three-dimensional image. Digital microscopes are used to display an image on a monitor, rather than looking through a lens. Microscopes can have monocular (one), binocular (two), or trinocular (three) eyepieces, with varying magnification abilities. Magnification ability refers to the size of an image. Resolution, also known as resolvant power, refers to the clarity of the image. The interaction between field of view (FOV), numerical aperture (NA), and working distance (WD) determines resolution. Microscopes can control magnification through a fixed focus, or through a range of adjustments. They can also utilize LED, fluorescent, and mirror light sources to help control viewing capabilities. Microscopes are widely used in education, lab research, biology, metallurgy, engineering, chemistry, manufacturing, and in the medical, forensic science, and veterinary industries.
BestScope International Ltd. manufactures microscopes, digital cameras, and accessories for education, inspection, research, and clinical and industrial applications. The company, founded in 1995, is headquartered in Beijing, China.
We understand that education has taken on a new look and feel over the past year and some of that may continue in the 2021-2022 academic year. Students, families, the U.S. Department of State, and AFS-USA will continue with their goals of intercultural learning and global citizenship while keeping safety as a top priority.
NBC Chief Foreign Correspondent and AFS Alumnus Richard Engel Addresses the AFS-USA Family
AFS-USA in Action: Our Response to COVID-19
AFSers are made for times like these—helping us adapt to our biggest challenge in 70 years and enabling us to become an even stronger organization! We continue to navigate the pandemic and while we still have many challenges, right now we have 1,100 students who are either studying here in the US or are US students studying abroad. We are well-poised for increasing success due to the continued interest of students who want to study abroad, and with strong support from host families, volunteers, and people like you.
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Our Mission and Impact
100 years of volunteerism. 70 years of exchange.
AFS-USA honors the legacy of its founders—volunteer WWI and WWII American Field Service ambulance drivers—who emerged from the wars with a bold mission: to help prevent future conflict through cultural exchange and understanding.
As a partner in the global AFS network, AFS-USA offers international exchange and education opportunities in over 45 countries and hosts exchange students from 90 countries. True to the spirit of our founders, these intercultural programs are made possible by the dedicated work of AFS Volunteers—more than 4,400 in the U.S. and over 50,000 worldwide.
Our diverse study abroad programs vary in length from a year to a few weeks and cover timely and timeless topics such as sustainability and language learning. What every program has in common is a commitment to fostering intercultural and global competence in our students, host families, schools, and communities. This cultural exchange helps us come together, across typical divides, to make a more peaceful and just world. That’s the #AFSEffect.
AFS-USA mourns the loss of lives and the tragic events affecting people in Afghanistan and is mindful of the importance of our mission to help build a more just and peaceful world.
AFS-USA embraces diversity at every level of our organization.
We are committed to creating safe and supportive intercultural learning opportunities for all high school study abroad participants, including persons with disabilities and people of all gender identities, ethnicities, races, religions, and sexual orientations.
Quarantine is temporary, but curiosity and wonder about the world is endless. As we’re social distancing, we can still continue international exchange online, become global citizens, and plan our next adventures.