PARALLAX, PENTAPRISMS AND PHOTOGRAPHY - pentaprism

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Handheldmagnifier for low vision

Low Power Objective (10X): This next shortest objective is probably the most useful lens for viewing slides. Almost any feature you need to observe in this course can be located with the 100X total magnification this objective provides. As an added benefit, the low power objective is always safe to use as it cannot be lowered to the point of contacting and thus possible breaking a slide. This is also true of the scanning objective mentioned above.

Oil Immersion Objective (100X): This longest objective is used for observing the detail of individual cells such as white blood cells, the cells involved in spermatogenesis, etc. The lens must be used with a specially formulated oil that creates a bridge between the tip of the objective and the cover slip. Since the refractive indices of air and this lens are different, the lens will not work without this special oil!

Apr 13, 2024 — The functioning of the light microscope is based on its ability to focus a beam of light through a specimen, which is very small and transparent ...

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Hand held Magnifier with Light

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These Illuminated Handheld Aspheric LED Lighted Magnifiers are available in a 4x Power 3″, 5x Power 2.5″ or 7x 1.5″ powers. Aspheric lens magnifiers allow for increased magnification and image clarity while greatly reducing edge to edge distortion. Their crystal-clear acrylic lens allows them to be lightweight enough to use for everyday tasks. These magnifiers are a great low vision aid and assists in reading small print. They feature an ultrabright LED light to brighten your viewing area. Uses 3 AAA batteries (not included).

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BestHandheldmagnifying glass with Light

High Power Objective (40x): This objective (sometimes called the "high-dry" objective) is useful for observing fine detail such as the striations in skeletal muscle, the arrangement of Haversian systems in compact bone, types of nerve cells in the retina, etc.

The Illuminated Handheld 1.5″ LED Lighted Magnifier is a 7x aspheric magnifier. Aspheric lens magnifiers allow for increased magnification and image clarity while greatly reducing edge to edge distortion. Its 1.5" crystal-clear acrylic lens allows it to be lightweight enough to use for everyday tasks. This is a great low vision aid and assists in reading small print. It features an ultrabright LED light to brighten your viewing area. Uses 3 AAA batteries (not included).

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Scanning Objective (4X): This shortest objective is useful for getting an overview of the slide (especially handy with some of the slides that contain whole organs like a section of the spinal cord, lung, digestive tract, ovary, etc.).

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Although your microscope may differ in some details from the one described in the web page above, most microscopes will have one or more of the following objective lenses. You should acquaint yourself with each of these objectives and their uses.

The Illuminated Handheld 5x Power 2.5″ Aspheric LED Lighted Magnifier is a 5x aspheric magnifier. Aspheric lens magnifiers allow for increased magnification and image clarity while greatly reducing edge to edge distortion. Its 2.5" crystal-clear acrylic lens allows it to be lightweight enough to use for everyday tasks. This is a great low vision aid and assists in reading small print. It features an ultrabright LED light to brighten your viewing area. Uses 3 AAA batteries (not included).

The Illuminated Handheld 4x Power 3″ Aspheric LED Lighted Magnifier is a 4x aspheric magnifier. Aspheric lens magnifiers allow for increased magnification and image clarity while greatly reducing edge to edge distortion. Its 3" crystal-clear acrylic lens allows it to be lightweight enough to use for everyday tasks. This magnifier is a great low vision aid and assists in reading small print. It features an ultrabright LED light to brighten your viewing area. Uses 3 AAA batteries (not included).

To use the lens, first make sure the specimen is in focus under the high power (40X) objective. Next, move the high power objective out of position, place a small drop of oil on top of the cover slip above the specimen to be viewed and move the oil immersion lens into place. Use the fine adjustment knob to bring the specimen into focus. When you are finished, make sure to clean the lens and slide with lens paper. Also, it is extremely important that this oil does not contact any of the other objectives. If this should happen, clean the lenses immediately!

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