| Customization: | Available |
|---|---|
| After-sales Service: | 1year |
| Warranty: | 1year |
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|
Objective magnification |
NA |
W.D |
W/M |
|
WD-9020 |
0.4 |
12mm |
W0.8 |
|
WD-9050 |
0.5 |
10.6mm |
|
|
WD-9100 |
0.8 |
3.3mm |
|
|
WD-9020BD |
0.4 |
12mm |
M26 |
|
WD-9050BD |
0.5 |
10.6mm |
|
|
WD-9100BD |
0.8 |
3.3mm |
Main technical parameters of objective lens
Effective focal length: the effective focal length of the objective lens. The distance from the main plane of the objective lens to the focus is expressed in F.
Numerical aperture: the numerical aperture of the objective lens is used to measure the receiving angle of the objective lens, expressed in Na, Na = n · sin( θ), Where n is the refractive index between the objective lens and the observed object, θ It is half of the maximum receiving angle of the objective lens.
Resolution: the resolution of the objective lens refers to the minimum distance between two object points that can be distinguished by the objective lens σ To show, σ= zero point six one λ/ Na, where λ Is the wavelength of the light used.
Magnification: the magnification of the objective lens refers to the ability of the objective lens itself to magnify the object several times, expressed in M, M = L / F, where l is the length of the optical lens barrel and F is the focal length of the objective lens. It can be seen from the formula that the magnification of the objective lens is related to the length of the lens barrel. The longer the lens barrel, the greater the magnification, but at the same time, the imaging quality will decline, so the length of the lens barrel cannot be changed at will. The standard barrel length of the microscope in the world is 160 mm, and that of Levitz in the Federal Republic of Germany was 170 mm. This figure is generally engraved on the objective lens shell.
Working distance: the working distance refers to the distance from the front surface of the objective lens to the surface of the observed sample. Generally, the larger the magnification, the smaller the working distance.
Focusing distance: the focusing distance refers to the distance from the positioning surface of the objective lens body to the object surface when aiming at the focus.
Number of fields of view: generally refers to the eyepiece rather than the objective lens. The number of field of view of the objective lens target of Olympus and other manufacturers refers to the field of view of the image side of the objective lens.
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