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[Sub 1]
Based on performance and appearance
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1. P-type lens]
(1) Automatic positioning lens itself pupil focus has been adjusted, you need to test the clarity of the maximum rate to a minimum magnification are the same, whether clear.
(2) test the concentricity, the maximum rate to the minimum magnification image in the same location can not be offset or offset is too large, are regarded as a bad product, it is necessary to replace the lens.
(3) optical magnification of 0.7-4.5X, 0.7 times to 4.5 times the total of nine kinds of magnification.
(4) definition to be judged according to the correction block, the actual object imaging reflect.
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2. E lenses]
(1) of this lens for general industrial lens, you need to manually adjust the pupil focus, after the machine is installed, manually adjust the maximum rate and minimum magnification, the image the same clear, if you can not adjust the definition as a bad product, if the regulator After the lens sway and other factors of instability, also regarded as a bad product.
(2) test the concentricity, the maximum rate to the minimum magnification image in the same location can not be offset or offset is too large, are regarded as a bad product, it is necessary to replace the lens.
(3) optical magnification of 0.7-4.5X.
(4) definition based on the calibration block, the actual object image reflected to the interpretation.
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3. L-type lens
(1) of this lens for general industrial lens, you need to manually adjust the pupil focus, after the machine is installed, manually adjust the maximum magnification and minimum magnification, the image the same clear, if you can not adjust the definition as a bad product, if the regulator After the lens sway and other factors of instability, also regarded as a bad product.
(2) test the concentricity, the maximum rate to the minimum magnification image in the same location can not be offset or offset is too large, are regarded as a bad product, it is necessary to replace the lens.
(3) optical magnification of 0.7-4.5X.
(4) definition based on the calibration block, the actual object image reflected to the interpretation.
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4 automatic zoom]
(1) for automatically positioning the lens itself pupil focus has been adjusted, need to be inspected from the maximum rate to a minimum magnification of clarity, are the same, is clear.
(2) test the concentricity, the maximum rate to the minimum magnification image in the same location can not be offset or offset is too large, are regarded as a bad product, it is necessary to replace the lens.
(3) optical magnification of 0.7-4.5X.
(4) definition based on the calibration block, the actual object image reflected to the interpretation.
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[Sub 2]
Zoom / fixed focus
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Fixed focus
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A standard lens]
(2) wide-angle lens]
(3) [lens]
Usually in the 36mm to 134mm lens in the lens. In focus the lens closer to the normal human perspective and sense of perspective scenery deformation, suitable for shooting a portrait, landscape, tourism, commemorative photos.
4 telephoto lens]
(5) [fisheye]
6 catadioptric lens]
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[Zoom]
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a. focus mode
Manual zoom / auto-zoom lens.
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b. according to the zoom range
In general,
20-40mm called ,35-70mm wide angle zoom lens as standard zoom lens.
Known as COSCO zoom lens, 200-500 known as telephoto zoom lens 70-200mm.
Of course, there are many lenses include wide-angle to focus, and even telephoto range, such as 28-200mm, 28-300mm and so on.
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c. according to zoom ratio
There are two times (for example, 35-70mm), 3-fold (70-210mm), 5-fold (28-135mm), 7-fold (28-200mm), 10 times (50-500mm) and so on.
Generally speaking, the greater the zoom range, volume correspondingly larger, the quality is relatively low, the aperture is relatively smaller.
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d. zoom way
Depending on the operation, divided into push-pull zoom / rotate zoom
Push-pull zoom
The advantage of the easy to use, can be quickly from the most remote zoom to the nearest side.
The disadvantage is that the pitch shot when the lens is easy to slide.
Rotary zoom
The advantage of the focus ring and zoom ring, the rotation operation and noninterference in each other.
Disadvantage of operating as good as the push-pull is simple, especially using the "zoom shot explosion effect", as the push-pull zoom is easy to implement.
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Two significant differences in lens appearance
Fixed focus lens only focus ring (that is, control definition, described later)
The zoom lens has two rings, a focus ring (control definition) and the zoom ring (control perspective, the push-pull).
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【Article is excerpted from: Baidu Encyclopedia】
【Network reprint / Just reference】
【Translation is by Goolge】
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