How to adjust the rear focal length of industrial cameras

The back focal length of an industrial camera, also known as the back focal length, refers to the fact that when a standard lens (standard C CS mount lens) is attached, the image of the subject can be exactly on the target surface of the CCD image sensor. Generally, when industrial cameras leave the factory, the back focal length has been appropriately adjusted, so there is generally no need to adjust the back focus of industrial cameras in applications where prime lenses are attached.

In some applications, it may be possible that the image is not sharp even when the lens focus ring is adjusted to the limit position, and it is necessary to first confirm that the lens is properly mounted. If it is confirmed, the back focal length of the industrial camera needs to be adjusted. As a rule of thumb, in the vast majority of applications where industrial cameras are equipped with motorized zoom lenses, it is often necessary to adjust the back focal length of the industrial camera.

The steps to adjust the back focal length of the industrial camera are as follows: 1. Correctly install the lens on the industrial camera; 2. Open the aperture of the lens to the maximum as much as possible (the purpose is to narrow the depth of field range to accurately find the imaging focus); 3. Push the lens to tele state by zoomin adjustment, take a close-up of an object 10m away, and then adjust the close-up image to be clear by adjusting the focus; 4. Zoomout the opposite zoom adjustment to pull the lens back to the wide-angle state, and the picture becomes a panoramic image containing the above-mentioned close-up objects, but the focus can not be adjusted at this time (note: if the image becomes blurry at this time, the focus cannot be adjusted), but prepare for the next step of post-focus adjustment; 5. Unscrew the hexagon screw that is used to fix the rear focus adjustment ring at the front end of the industrial camera, and rotate the back focus adjustment ring (for the camera without the back focus adjustment ring, directly rotate the lens and drive its built-in back focus ring) until the picture is the clearest, and then temporarily tighten the hexagon screw; 6. Re-push the lens to the telephoto state to see if the close-up object you just shot is still clear, if not, repeat the above steps; It usually only takes one or two rounds to adjust the focal length, and finally tighten the Allen socket screws to adjust the aperture to the proper position.

This article is provided to you by Pomeas Primus Optics, a professional manufacturer of industrial lenses, Zoom lenses, continuous zoom lenses, telecentric lenses, megapixel industrial lenses, measuring microscopes, microscopes, and tool microscopes.

The steps to adjust the rear focal length of an industrial camera are as follows:

1.Properly mount the lens on the industrial camera;

2.Make the aperture of the lens as wide as possible (the aim is to reduce the depth of field and find the exact focus of the image);

3.Zoomln pushes the lens to tele to take a close-up of an object 10 meters away, and then adjusts the close-up image clearly by adjusting the focus (focus).

4.Adjust the zoom distance opposite to the previous step to bring the lens back to the wide. At this point, ** will become a panoramic image containing the close-up object described above, but focus adjustment cannot be made at this time (Note:

If the image becomes blurry at this point, you can't adjust the focus), but prepare for the next step of backfocus adjustment;

5.Loosen the hexagon screw at the front end of the industrial camera that is used to fix the rear focus adjustment ring, rotate the back focus adjustment ring (the camera without the back focus adjustment ring directly rotates the lens to drive the built-in back focus ring) until it is the clearest, and then temporarily tighten the hexagon screw;

6.Push the lens back into telephoto to see if the close-up shot you just took is still sharp. If it is unclear, repeat the steps above; Usually, focus adjustment only takes one or two rounds. Finally, tighten the Allen socket screws and adjust the aperture to the appropriate position.

1. Take the Canon 220F model as an example, first adjust to the aperture priority.

2. Then turn the gear left and right to adjust the aperture, the place circled out in the following picture is the value of the aperture, and the value of the aperture refers to the maximum or minimum age, because the lens is different.

3. You can adjust it to 5 first, the default of the camera is 5 at the beginning, take this value first.

4. The afternoon is the effect of this value, you can take a look, and the back is more blurry.

5. Adjust the value to 13 and shoot again.

6. Finally, take a look at the effect, this is more clear.

1. First of all, if we want to focus, in the process of taking pictures, we must understand where the direction of the sunlight is delayed and the light is coming, and reduce the focal length through the sunlight.

2. Second, we must be clear about the backlight and Shunguang, if we are in the process of taking pictures, we will increase the standard focal length, otherwise, reduce the standard focal length, as for what the standard focal length is, the general camera mode is the standard focal length.

3. Third, for which scenes need to be taken extraordinarily, then, when these objects are photographed, we directly increase the focal length, and for the surrounding, we will reverse the decrease, so that the ** will give people a sense of connotation.

4. Fourth, if we need a sense of wholeness, rather than connotation, then, when taking pictures, we only need to make the focal length slightly adjustable between the standard focal lengths.

5. Fifth, there are many types of cameras, if we buy a photosensitive camera, then, when adjusting the focal length, we must correct the camera, and in the process of taking pictures, slowly move the focal length until the first person reaches Gao Dan or count.

6. Sixth, many people not only ask how to adjust the focus of the capture, first of all, when capturing, we first adjust the ** focal length to the standard position, first judge the distance of the object, and when it appears, shoot directly according to the prior adjustment.

Theoretically speaking, the process of changing the distance from the optical center of the lens to the film to get a clear image on the film is called focusing, also known as focusing. Most of today's lenses have an AF autofocus function, while retaining the MF function of manual disturbance, and when focusing manually, you can adjust the sharpness of the subject on the focal plane by twisting the focus ring. Each prime lens has a fixed focal length value f, which cannot be adjusted.

For example, the focal length of the lens is always 50mm.

The focal length (f) of a zoom lens can be adjusted within a certain range, such as a lens, which has an F-number that can be continuously adjusted between 24mm and 70mm. By twisting the lens zoom ring, the purpose of zoom can be achieved.

Lens focal length: refers to the distance from the principal point to the focal point after the lens optics, which is an important performance indicator of the lens. The length of the focal length of the lens determines the size of the image, the size of the field of view, the depth of field and the perspective strength of the image.

The focal length of the lens is a very important indicator of the lens. The length of the focal length of the lens determines the size of the subject imaged on the imaging medium (film, CCD, etc.), which is equivalent to the scale of the object and the image.

The focal length of a DSLR camera can only be achieved by manually adjusting the zoom ring, and the focus can be switched to manual focus and autofocus.

SLR digital camera refers to single-lens reflex digital camera, that is, digital digital, single, lens lens, reflex reflex English abbreviation DSLR. SLR stands for Single Lens Reflex, or SLR (SingleLensReflex), which is the most popular viewfinder system available today, and is used in most 35mm cameras. These cameras are generally larger and heavier.

In the working system of a DSLR digital camera, the light passing through the lens reaches the mirror, and is reflected to the upper focusing screen and formed into an image, through the eyepiece and the pentaprism, we can see the outside scene in the viewing window. In contrast, a digital camera can only see the image through an LCD screen or an electronic viewfinder (EVF). Obviously, images that are seen directly are easier to shoot than images that are seen through processing.