|System Optical Magnification
|10X Adjustable Eyepiece
|1X Built-in Objective
|System Field of View
|System Working Distance
|Body Optical System
|Zoom Operating Mode
|With Two Horizontal Knobs
|Body Mounting Size for Stand
|1X per pre-set stop
|Nosepiece Adapter Size for Ring Light
|Eye Tube Adjustment Mode
|Eye Tube Angle
|Eye Tube Rotatable
|360° Degree Rotatable
|Eye Tube Inner Diameter
|Eye Tube Fixing Mode
|Elastic Tube locking
|Eyepiece Optical Magnification
|Eyepiece Size for Eye Tube
|Eyepiece Field of View
|High Eyepoint Eyepiece
|Eyepiece Size for Reticle
|Eyepiece Diopter Correction
|Objective Working Distance
|Objective Screw Thread
|76mm Horizontal Oil-Immersed Gem Stand
|Holder Adapter Type
|Dia. 76mm Scope Holder
|Coarse Focus Distance per Rotation
|Focusing Knob Tightness Adjustable
|LED Coaxial Transmitted Light
|Bottom Illumination Type
|LED Spot Light
|Incident Light Source Type
|Field Diaphragm Mounting Position
|Field Diaphragm Outer Diameter
|AC 100-240V 50/60Hz
|Power Cord Connector Type
|USA 3 Pins
|Power Cable Length
|Gemology/jewelry microscope is a microscope used to observe some of the invisible details on the surface and inside of jewels, gems, and various crystals when observing.
The surface features of jewellery, include scratches, breakage, color circles, etches, cleavage, cracks, split faces, polish, etc.; internal features, include the types of contents, the inclusions, growth lines, double crystal lines, textures, ribbons, and the doubling of the rear facet edge of the gemstone etc. For these features, it is very necessary to use gemology/jewelry microscope for observation and identification, and it has also an extremely important application in diamond grading, making it an essential instrument for gem identification.
For general jewellery observations, the defects and features after 10X magnification are considered the basis for economic evaluation. For jewelry microscope, stereo microscope is generally used, with a magnification of 10-80X or higher, and more detailed features can be seen. According to the characteristics of jewelry observation, jewelry microscope requires large depth of field, which can present the diamonds, jewelry interiors and their polyhedral structure, with true color reproduction effect.
Due to the different types of gemstones being observed, jewelry microscope needs to be matched with a variety of light sources and illumination forms. For lighting, usually full-color light is used, its continuous spectrum reflects the true color of the jewelry, and can achieve good observation effect for transparent, translucent and opaque object. The lighting methods of gemology microscope mainly include:
Reflective illumination: use the reflector lamp above to observe opaque or translucent objects, as well as the surface features of the gem, such as the ports, cleavage surfaces, ribbons, and gemstone grinding etc.
Transmitted illumination method: the transmitted light at the bottom is used to observe the internal features and defects of the gemstone. Usually, the bottom light is a diffuse reflection light source with dark field illumination, and there is a switch button, in the center of the bottom light, there is a black disc "light block", used to switch the light and dark field of view conversion of the bottom light.
Transmitted bright field illumination: the transmitted light can penetrate the interior of a gemstone. Against a bright background, details within the jewellery such as inclusions, textures, growth lines and ribbons can be seen clearly.
Transmitted light field dark illumination: after the bottom light is blocked by the "light block", it cannot directly enter the field of view of the objective lens, forming a diffuse reflection illuminating the gem around it, which is convenient for observing the inclusions, cracks and growth lines of the gemstone, and seeing the details that are not easy to find in bright field.
Spot light illumination method: adjust the aperture diaphragm (aperture) to a position close to the smallest suitable size, so that the bottom light is reduced into a dot shape, and the light penetrates from the bottom of the gemstone for illumination, so that the ribbon and the structural feature points of the gemstone are more prominent.
Horizontal illumination method: use a sidelight to illuminate the gemstone horizontally from the side, so that the gem dot-like inclusions, textures, and bubbles etc. present striking and bright image under the vertical direction light illumination.
Masking illumination method: use the bottom light bright field for illumination, insert an opaque light barrier in the field of view to increase the three-dimensional sense of the internal feature points in the black and white boundary of the light, which helps to observe the growth structure of the gem, such as the bending growth lines, double crystal lines, etc.
Scattering illumination method: use the bottom light bright field for illumination, place a tissue or other translucent material on the light source to make the light softer, which helps to observe the color gamut and the ribbon, especially to observe the diffusion treatment effect of the gemstone.
Polarized illumination method: under the bottom light source and the objective lens, a polarizer piece is added respectively to produce a polarizing effect, which can help to observe the interference effect, pleochroism and the optical characteristics of the gemstone.
For more precautions for use of gemology/jewelry microscopes, please refer to the Stereo Microscope on the BoliOptics website.
|Microscopes and components have two types of optical path design structures.
One type is finite optical structural design, in which light passing through the objective lens is directed at the intermediate image plane (located in the front focal plane of the eyepiece) and converges at that point. The finite structure is an integrated design, with a compact structure, and it is a kind of economical microscope.
Another type is infinite optical structural design, in which the light between the tube lens after passing the objective lens becomes "parallel light". Within this distance, various kinds of optical components necessary such as beam splitters or optical filters call be added, and at the same time, this kind of design has better imaging results. As the design is modular, it is also called modular microscope. The modular structure facilitates the addition of different imaging and lighting accessories in the middle of the system as required.
The main components of infinite and finite, especially objective lens, are usually not interchangeable for use, and even if they can be imaged, the image quality will also have some defects.
The separative two-objective lens structure of the dual-light path of stereo microscope (SZ/FS microscope) is also known as Greenough.
Parallel optical microscope uses a parallel structure (PZ microscope), which is different from the separative two-object lens structure, and because its objective lens is one and the same, it is therefore also known as the CMO common main objective.
|The magnification of the objective lens refers to the lateral magnification, it is the ratio of the image to the real size after the original image is magnified by the instrument. This multiple refers to the length or width of the magnified object.
System optical magnification is the product of the eyepiece and the objective lens (objective lens zoom set) of the optical imaging part within the system.
Optical magnification = eyepiece multiple X objective lens/objective lens set
The maximum optical magnification of the microscope depends on the wavelength of the light to which the object is illuminated. The size of the object that can be observed must be greater than the wavelength of the light. Otherwise, the light cannot be reflected or transmitted, or recognized by the human eye. The shortest wavelength of ultraviolet light is 0.2 microns, so the resolution of the optical microscope in the visible range does not exceed 0.2 microns, or 200 nanometers. This size is converted to the magnification of the microscope, and it is the optical magnification of 2000X. Usually, the compound microscope can achieve 100X objective lens, the eyepiece is 20X, and the magnification can reach 2000X. If it is bigger, it will be called "invalid magnification", that is, the image is large, but the resolution is no longer increased, and no more details and information can be seen.
|Total magnification is the magnification of the observed object finally obtained by the instrument. This magnification is often the product of the optical magnification and the electronic magnification.
When it is only optically magnified, the total magnification will be the optical magnification.
Total magnification = optical magnification X electronic magnification
Total magnification = (objective X photo eyepiece) X (display size / camera sensor target )
|Field of View, is also called FOV.
The field of view, or FOV, refers to the size of the object plane (i.e., the plane of the point of the observed object perpendicular to the optical axis), or of its conjugate plane (i.e., object to primary image distance), represented by a line value.
System field of view is the size of the actual diameter of the image of the terminal display device of the instrument, such as the size of the image in the eyepiece or in the display.
Field of view number refers to the diameter of the field diaphragm of the objective lens, or the diameter of the image plane formed by the field diaphragm.
Field of view number of objective lens = field of view number of eyepiece / (objective magnification / mechanical tube length)
Large field of view makes it easy to observe the full view and more range of the observed object, but the field of view (FOV) is inversely proportional to the magnification and inversely proportional to the resolution, that is, the larger the field of view, the smaller the magnification, and also the lower the resolution of the object to be observed.
There are usually two ways to increase the field of view, one is to replace with an objective lens of a smaller multiple, or to replace with an eyepiece of a smaller multiple.
|Working distance, also referred to as WD, is usually the vertical distance from the foremost surface end of the objective lens of the microscope to the surface of the observed object.
When the working distance or WD is large, the space between the objective lens and the object to be observed is also large, which can facilitate operation and the use of corresponding lighting conditions.
In general, system working distance is the working distance of the objective lens. When some other equipment, such as a light source etc., is used below the objective lens, the working distance (i.e., space) will become smaller.
Working distance or WD is related to the design of the working distance of the objective lens. Generally speaking, the bigger the magnification of the objective lens, the smaller the working distance. Conversely, the smaller the magnification of the objective lens, the greater the working distance.
When it is necessary to change the working distance requirement, it can be realized by changing the magnification of the objective lens.
|Binocular zoom body is the main body of a stereo microscope that has continuous zooming functions and observes with two eyepieces.
This body usually needs to be placed on a microscope stand for use. Generally, a variety of eyepieces and objective lenses with different magnifications can be selected. A high-end stereo microscope usually has a wide range of accessories for selection.
|Zoom in zoom microscope means to obtain different magnifications by changing the focal length of the objective lens within a certain range through adjustment of some lens or lens set while not changing the position of the object plane (that is, the plane of the point of the observed object perpendicular to the optical axis) and the image plane (that is, the plane of the image imaging focus and perpendicular to the optical axis) of the microscope.
Zoom range refers to the range in which the magnification is from low to high. In the zoom range of the microscope, there is no need to adjust the microscope knob for focusing, and ensure that the image is always clear during the entire zoom process.
The larger the zoom range, the stronger the adaptability of the range for microscope observation, but the image effects at both ends of the low and high magnification should be taken into consideration, the larger the zoom range, the more difficult to design and manufacture, and the higher the cost will be.
|Zoom ratio is the ratio of the maximum magnification / the minimum magnification. Expressed as 1: (ratio of maximum magnification / minimum magnification). If the maximum magnification is 4.5X, the minimum magnification is 0.7X, then the zoom ratio = 4.5 / 0.7 = 6.4, the zoom ratio will be 1:6.4.
Zoom ratio is obtained by the intermediate magnification group of the microscope. When the magnification is increased or decreased by using other objective lenses, the zoom ratio does not change accordingly.
|When microscope body changes the magnification, it is realized by adjusting the horizontally placed zoom knob. Because the knob is relatively small, it is therefore easier to zoom and the image is stable.
For most of the dual stereo microscopes, magnification is realized by adjusting the zoom drum or nosepiece below. When the nosepiece is relatively big, frequent operation is more laborious. Magnifying while observing, the microscope may shake, thereby causing eye discomfort for observation.
Using zoom drum or nosepiece type microscope, if there is a ring light under the microscope, the ring light carries the wire, and when magnification conversion is often required, the ring light and the wire will swing along with the magnification, which makes the operation inconvenient. This situation will not occur to zoom with two horizontal knobs.
|In the body of zoom microscope, zooming is continuous. When rotating to a certain position, generally an integral multiple, a positioning structure or detent is added, which has a distinct hand feel during the zooming process, and stops at this position.
When measuring, or testing by factory for unified standard magnification, a magnification detent device can avoid the error caused by the inaccurate multiple positioning of the optical magnification.
|For compensating eyetube, when changing the interpupillary distance, it requires two hands to operate at the same time, with one hand fixing one eyepiece tube, and the other pushing or pulling the other, or both the left and the right hand pushing the two eyetubes at the same time, and changing the position of any one of the eyetube at will.
|Usually the Microscope Eyetube is 45°, some is 30°, Tiltable Eyetube Angle design of a microscope is also known as the ergonomics microscope.
0-30° or 0-45° is an ergonomic design. When the mechanical tube length / focal length of the tube of the microscope is relatively big, the microscope is relatively high, and the user's height or the seat of the work desk is not suitable, long-term use of microscope may cause sitting discomfort.
Eyepiece tube with variable angle can freely adjust the angle without lowering the head. Especially when it is close to 0 degree and the human eye is close to horizontal viewing, long-time or long-term use can avoid fatigue damage to the cervical vertebra.
|After imaging through a set of objective lenses, the object observed and the image seen by the human eye is inverted. When the observed object is manipulated, move the specimen or object, the image will move in the opposite direction in the field of view. Most of the biological microscopes are reversed-phase designs.
When needing to operate works with accurate direction, it is necessary to design it into a forward microscope. Generally stereo microscopes and metallurgical microscopes are all of erect image design.
When observing through the camera and display, the erect and inverted image can be changed by the orientation of the camera.
|The eyepiece of the microscope can have different viewing or observing directions. When the position of the microscope is uncomfortable, the direction of the eyepiece tube of the microscope can be adjusted, to facilitate observation and operation.
Placement method of different viewing angles of the microscope:
General direction: the support column is behind the object to be observed
Reverse direction: the support column is in front of the object to be observed
Lateral direction: the support column is on the side of the object to be observed
Rotating eyepiece tube, different microscopes may have different methods, for some, the direction is confirmed when installing the eyepiece tube of the microscope, for some, by rotating the body of the microscope, and for some, by rotating the support member on the support or holder of the microscope.
|The distance between the two pupils of the human eye is different. When the image of exit pupil of the two eyepieces of the microscope are not aligned with the entry pupil of the eye, the two eyes will see different images, which can cause discomfort.
Adjust the distance between the two eyepieces, to accommodate or adapt to the pupil distance of the observer's eyes. The adjustment range is generally between 55-75mm.
|The adjustable eyepiece is between the lens of the eyepiece and the focal plane, with distance adjustable device.
For most people, their two eyes, the left and the right, have different vision. For adjustable eyepieces, the eyepoint height of the eyepiece can be adjusted to compensate for the difference in vision between the two eyes, making the image in the two eyes clear and consistent.
The range of adjustment of the general eyepiece is that the diopter is plus or minus 5 degrees, and the maximum difference between the two eyepieces can reach 10 degrees. Before use, it is generally necessary to adjust both eyepieces to the initial position where the scale is displayed as 0, which is used as a baseline to facilitate up and down adjustment.
The reticle position of the eyepiece is generally 10mm below the fixed position of the eyepiece tube. Because the vision of each person is different, some people may not be able to see the reticle clearly. For adjustable eyepiece, the height of the reticle position can be adjusted to make the reticle and the observed object clear at the same time, this is the advantage of adjustable eyepiece that mounts the diopter adjustment on the eyepiece tube compared with non-adjustable eyepiece.
When non-adjustable eyepiece is equipped with a reticle, if the diopter is adjusted, the reticle will rotate accordingly, thereby affecting the position of the measurement. For adjustable eyepiece, when its diopter is adjusted, its reticle does not rotate.
|Eyepiece optical magnification is the visual magnification of the virtual image after initial imaging through the eyepiece. When the human eye observes through the eyepiece, the ratio of the tangent of the angle of view of the image and the tangent of the angle of view of the human eye when viewing or observing the object directly at the reference viewing distance is usually calculated according to 250 mm/focal length of eyepiece.
The standard configuration of a general microscope is a 10X eyepiece.
Usually, the magnification of the eyepiece of compound microscope is 5X, 8X, 10X, 12.5X, 16X, 20X.
As stereo microscope has a low total magnification, its eyepiece magnification generally does not use 5X, but can achieve 25X, 30X and other much bigger magnification.
|The eyepiece field of view is the diameter of the field diaphragm of the eyepiece, or the diameter of the image plane of the field diaphragm imaged by the field diaphragm.
The diameter of a large field of view can increase the viewing range, and see more detail in the field of view. However, if the field of view is too large, the spherical aberration and distortion around the eyepiece will increase, and the stray light around the field of view will affect the imaging effect.
|Eye point refers to the axial distance between the upper end of the metal frame of the eyepiece and the exit of pupil.
The exit of pupil distance of high eyepoint eyepiece is farther than that of the eye lens of the ordinary eyepiece. When this distance is greater than or equal to 18mm, it is a high eyepoint eyepiece. When observing, one does not need to be too close to the eyepiece lens, making it comfort to observe, and it can also be viewed with glasses. Generally, there is a glasses logo on the eyepiece, indicating that it is a high eyepoint eyepiece.
|The objective working distance is the vertical distance from the foremost surface end of the objective of the microscope to the object surface to be observed.
Generally, the greater the magnification, the higher the resolution of the objective, and the smaller the working distance, the smaller the field of view. Conversely, the smaller the magnification, the lower the resolution of the objective, and the greater the working distance, and greater the field of view.
High-magnification objectives (such as 80X and 100X objectives) have a very short working distance. Be very careful when focusing for observation. Generally, it is after the objective is in position, the axial limit protection is locked, then the objective is moved away from the direction of the observed object.
The relatively greater working distance leaves a relatively large space between the objective and the object to be observed. It is suitable for under microscope operation, and it is also easier to use more illumination methods. The defect is that it may reduce the numerical aperture of the objective, thereby reducing the resolution.
|For microscopes of different manufacturers and different models, the thread size of their objectives may also be different.
In general, the objective threads are available in two standard sizes, allowing similar objectives between different manufacturers to be used interchangeably.
One is the British system: RMS type objective thread: 4/5in X 1/36in,
One is metric: M25 X 0.75mm thread.
|Jewelry microscope stand is a special stand designed to detect jewelry, diamonds, etc. A jewelry stand is usually equipped with the following several light sources and devices:
Upper light source has both natural light of a halogen lamp and fluorescent lamp. The fluorescent lamp is usually a "full-wave band" fluorescent lamp. The use of a natural light with continuous wave band can ensure the effect of observing jewelry and diamonds, and is consistent with the effect color seen under daylight.
Lower light source: diffuse reflection light with dark field equipment is often used, and some advanced stand are also equipped with iris diaphragm. Uniform illumination can eliminate reflection and stray light to facilitate observation of details of the jewelry or diamond.
Jewelry clips are used to clip or clamp jewels and diamonds.
|The 76mm stand scope holder is the most popular microscope body adapter size, suitable for stereo microscopes produced by most manufacturers.
Place the microscope body in a 76mm scope holder, tighten with screws to avoid shaking when the microscope is in use.
Because this stand scope holder is very common, some special-sized microscopes can also borrow and use this stand, but only need a specific adapter to connect the microscope body with a diameter of less than 76mm.
|Illumination base is a modular light source component, suitable for microscope stand base that has no light source of itself, and it is usually dedicated components supporting some stands.
Illumination base typically includes at least one bottom lighting, and there are also illumination base that includes the circuit portion of the upper light source.
|Different microscope bodies, different human operations, and different requirements for observation and operation, all require adjustment of the pre-tightening force of the stand that support microscope body.
Facing the stand just right, use both hands to reverse the force to adjust the tightness. (face the knob of one side just right, clockwise is to tighten, counterclockwise is to loosen)
In general, after long-time use, the knob will be loose, and adjustment is necessary.
|After unpacking, carefully inspect the various random accessories and parts in the package to avoid omissions. In order to save space and ensure safety of components, some components will be placed outside the inner packaging box, so be careful of their inspection.
For special packaging, it is generally after opening the box, all packaging boxes, protective foam, plastic bags should be kept for a period of time. If there is a problem during the return period, you can return or exchange the original. After the return period (usually 10-30 days, according to the manufacturer’s Instruction of Terms of Service), these packaging boxes may be disposed of if there is no problem.
|Microscope Optical Data Sheet
|Objective Working Distance
|SZ17011121 (10X Dia. 22mm)
|SZ04023421 (15X Dia. 16mm)
|SZ17013421 (15X Dia. 16mm)
|SZ04023621 (20X Dia. 12.5mm)
|SZ17013621 (20X Dia. 12.5mm)
|Field of View(mm)
|Field of View(mm)
|Field of View(mm)
|Field of View(mm)
|Field of View(mm)
|1. Magnification=Objective Optical Magnification * Body Magnification * Eyepiece Optical Magnification
|2. Field of View=Eyepiece Field of View /（Objective Optical Magnification*Body Magnification）
|3. The Darker background items are Standard items, the white background items are optional items.
|Inner Packing Material
|Ancillary Packaging Materials
|Minimum Packaging Quantity
|Transportation Carton Material
|Transportation Carton Dimensions(1)
|Transportation Carton Dimensions(2)
|Total Gross Weight of Transportation(kilogram)
|Total Gross Weight of Transportation(pound)
|Quantity of One Transportation Carton