Fixed focal lengthlens

With the optical magnification, interface, and back focus, the working distance and the length of the joint ring can be calculated. After selecting these, there is another important link, which is to see if the MTF value is good enough? Many visual engineers do not understand MTF, but for high-end lenses, MTF must be used to measure optical quality.

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Line scan lens betanikon

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Line scancameralens

The aperture is the opening created by a set of overlapping metal blades, known as the diaphragm, inside a photographic lens. This opening controls the amount of light coming through the lens. The wider the aperture, the less depth of field you capture. The smaller the aperture, the deeper the depth of field.

All but the simplest cameras contain lenses which are actually comprised of several "lens elements." Each of these elements directs the path of light rays to ...

In this image a medium depth of field allows the viewer to focus on multiple subjects without creating confusion for your eyes Photo by Sebastian J. Sciotti Jr. In this image a medium depth of field allows the viewer to focus on multiple subjects without creating confusion for your eyes Download Image  Share Image: X Facebook Email Photo by: Sebastian J. Sciotti Jr. VIRIN: 170525-D-SS007-019C

The focal length of the lens determines the image magnification. The wider the lens, the shorter the focal length. This allows you to capture a wider depth of field. The longer or more zoomed in the camera lens, the less depth of field you capture.

SWIRlens

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The line array CCD lens is a high-performance FA lens for line sensor series cameras corresponding to image size, pixel size, and can be applied to various high-precision inspections.

You can affect the depth of field by changing the following factors: aperture, the focal length and the distance from the subject.

C-MountLens

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Obviously, the C interface is far from meeting the requirements, because the C interface can only connect chips with a maximum size of 22mm, that is 1.3 inches. The interface of many cameras is F, M42X1, M72X0.75, etc. Different lens interfaces correspond to different back focus (Flange distance), which determines the working distance of the lens.

The back focus refers to the distance from the camera interface plane to the chip. It is a very important parameter and is determined by the camera manufacturer according to its own optical path design. Cameras from different manufacturers, even with the same interface, may have different back focus.

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Depth of field (DoF) is the area between the nearest and farthest points from the camera that are acceptably sharp in an image. A deep DoF means all or most of your photo will be in focus, including the foreground, subject and background. Use a deep DoF in group photos, landscape shots and when elements in the background or foreground add to the message the photo is attempting to communicate. A shallow DoF means more narrow range will be acceptably sharp in the image. Shallow DoF is good to use when you want to isolate your subject from their surroundings, such as in a portrait or when elements in the background or foreground may be distracting.

Line scan lens betaapp

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Distance to subject refers to the length between the camera and the focus of the image. The closer the camera is to the subject it is focusing on, the narrower the depth of field will be. Inversely, the farther away the subject is from the camera, the wider the depth of field will be.

Line scan lens betareview

Why should we consider the lens selection when choosing a camera? Common line scan cameras currently have resolutions of 1K, 2K, 4K, 6K, 7K, 8K, and 12K, and pixel sizes of 5um, 7um, 10um, and 14um, so that the size of the chip ranges from 10.240mm (1Kx10um) to 86.016mm (12Kx7um) varies.

The following graphic illustrates how changing these factors: aperture, focal length and the distance from the subject affect the depth of field.

Infographic illustrates how changing the aperture, the focal length and the distance from the subject affect the depth of field. Download Image  Share Image: X Facebook Email Photo by: DINFOS PAVILION Team VIRIN: 200907-D-PA656-0002

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Line scan lens betaprice

There are mainly C, M42x1, F, T2, Leica, M72x0.75, etc. After confirming, you can know the length of the corresponding interface.

In this image you can see how a shallow depth of field keeps the focus on the action. Photo by Samuel King In this image you can see how a shallow depth of field keeps the focus on the action. Download Image  Share Image: X Facebook Email Photo by: Samuel King VIRIN: 170908-F-OC707-0517C

Scanning lenses are widely used in AOI, printing inspection, non-woven fabric inspection, leather inspection, railway track inspection, screening and color sorting and other industries. This article brings an introduction to line scan lenses.

In this image a deep depth of field allows the viewer to take in many subjects, including an artillery shell mid-flight. Photo by Staff Sgt. Steven Schneider In this image a deep depth of field allows the viewer to take in many subjects, including an artillery shell mid-flight. Download Image  Share Image: X Facebook Email Photo by: Staff Sgt. Steven Schneider VIRIN: 170918-O-N0132-7230C

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Once the camera resolution and pixel size are determined, the sensor size can be calculated; the sensor size divided by the field of view(FOV) is equal to the optical magnification. β=CCD/FOV

MTF covers a wealth of information such as contrast, resolution, spatial frequency, chromatic aberration, etc., and expresses the optical quality of the center and edge of the lens in great detail. Not only the working distance and field of view meet the requirements, but the contrast of the edges is not good enough, but also whether to choose a higher resolution lens should be reconsidered.