Stereo Microscopes
Stereo Microscopes
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Luxo 18711 System 250-RLI Stereo Zoom Binocular with BoomStand and Fiber Optic Ring Light
List Price:  |
DescriptionBinocular style interpupilary adjustment; Each eyepiece has adjustable diopter setting; Field of View - 31 - 4.5mm; Working distance - 95mm; Heavy duty cast metal body; 45 Degree Stereo zoom body; Parfocal zoom; Optical magnification: 6... |
The Lenses System of the Microscope: Phase Contrast Explained
To understand the microscope more, you need to understand its parts. You need to understand what each part is capable of.
This article, however, will only focus on the lenses system - the whole group responsible in forming the image.
The Eyepiece
Without this part, you cannot see the specimen being examined. This is by far, among the most important parts of the microscope. This is a cylindrical tube which contains a lens. Stereo microscopes have two eyepieces, while a Compound Microscope only has one.
The Objective Lenses
The primary role of the objective lenses is to gather light from the object or specimen being observed. There are several objective lenses in a microscope. Each lens varies according to magnification to provide you with more options for better specimen examination.
Sometimes, special objectives are Used for certain examination techniques. The phase contrast - developed by Frits Zernike - is by far the most sophisticated. The phase contrast technique is basically about enhancing contrast. As a general rule, you can easily differentiate two specimens or even objects if they have high contrast - white is better seen when set against a black background.
Books and even Internet articles that explain the phase contrast method seems too technical for this kind of article - one that's focused in explaining the lenses system of the microscope. Still, to give you an idea on the concept of the phase contrast microscopy, this simple explanation would do:
It's a bit hard to have a microscopic view of living tissues (such as blood) because most of them are transparent. These kinds of specimen are usually called phase objects because they do not absorb light - instead, they diffract (to cause the bending of the waves) them. As a result of the bending, the light becomes less visible (by 1/4 wavelength). Let's not discuss what 1/4 wavelength really means but simply put, it suggests that such a reduced property of light cannot be seen by your naked eye, not even by a camera.
It is in this context that the phase contrast technique becomes very useful. Somehow, this technique - using special objectives and a condenser - is able to solve such a problem. It is able to yield an image that is darker than its light background.
Other special objectives are the infinity-corrected optical systems - where the image distance is set at infinity. These lenses are great for biomedical and industrial microscopes.
The Nosepiece
As mentioned, most microscopes have more than one objective lenses. As such, these objectives need something to hold them together - and this is where the nosepiece comes in handy.
The Tube
This is the very thing that holds the eyepiece and the objective lenses - but at an appropriate distance. This is responsible for keeping away stray light.
While the lenses are already powerful enough, some still prefer to use accessories such as a fluorescent filter. This is done in order to get optimum lighting and for special viewing techniques.
Once again, these parts only refer to the lenses system of a microscope. These are the ones responsible in forming the image of the specimen. You still need to acquaint yourself with the other parts - such as the illumination system and specimen control to better understand how the microscope works.
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Luxo 18711 System 250-RLI Stereo Zoom Binocular with BoomStand and Fiber Optic Ring Light
List Price: |
DescriptionBinocular style interpupilary adjustment; Each eyepiece has adjustable diopter setting; Field of View - 31 - 4.5mm; Working distance - 95mm; Heavy duty cast metal body; 45 Degree Stereo zoom body; Parfocal zoom; Optical magnification: 6... |
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Spare Halogen Bulb, 12v, 10w (top Light) - Accessory For Stereo Microscopes, K Series, Motic
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DescriptionThese stereo microscopes feature a pair of 10x, 23mm Super Widefield eyepieces and a 45 degrees inclined binocular tube with dioptric compensation on both tubes and interpupillary distance adjustment between 54mm and 76mm... |
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Import 10x + 30x 110vlt 15wtt Stereo Microscope
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DescriptionStereo Microscope Type: Stereo Magnification: 10x & 30x (Dual) |
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C&A Scientific Stereo Dissecting Microscope (C&A SMD-03)
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DescriptionThe C&A SMD-03 is suitable for observing any small three-dimensional object. The real optical glass lenses offer a clear, non-inverted image of the specimen magnified 20X. The 45 degree(s) inclined monocular head rotates easily... |
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DescriptionVideo. Still capture resolution: 2560x2048 (5M), 2000x1600, 1600x1280 (2M), 1280x1024, 1024X960, 1024x768, 800x600, 640x480, 352x288, 320x240, 160x120. Max 30f/s under 600 lus brightness. 20x to 200x. AVI video format... |
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Aven 26700-300 ZipScope Usb Digital Microscope with 2 Mega-Pixel 10x-50x Optical, 200x Digital Magnification
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Description26700-300 Connector: USB Features: -Microscope. -Blue finish. -Available in USB or wireless. -Adjustable Led Light. -Large focus knob. -Included image capture software and metal stand. Specifications: -Image sensor: 0... |
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AmScope 10x-20x-30x-60x Student Binocular Stereo Microscope with Incident (Top) and Transmitted (Bottom) Lights
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DescriptionThis binocular stereo microscope comes with four magnification power settings (10X, 20X, 30X & 60X) and a versatile illumination system that provides both incident (top) lighting and transmitted (bottom) lighting... |
