Basic knowledge of lens

The lens has two fingers in film and television. One is the optical element used by film cameras and projectors to produce images, which consists of multiple lenses. So how much do you know about cameras? The following is my lens knowledge, I hope you like it!

Performance and shape of lens

According to the performance and appearance of lenses, there are currently P-type, E-type, L-type and auto-zoom lenses. The information from China Instrument Supermarket is described as follows:

1, p lens

(1) Automatically position the lens, and the pupil focus has been adjusted. It is necessary to check whether the definition from the maximum magnification to the minimum magnification is consistent and clear.

(2) Check the coaxiality, that is, the images from the maximum magnification to the minimum magnification are taken at the same position, and cannot be offset or offset too much, which is regarded as defective, and the lens must be replaced again.

(3) The optical magnification is 0,7? 4, 5X, that is, 0, 7 times to 4, 5 times, a total of 9 times.

(4) Judging the clarity according to the imaging reflection of the correction block and the actual object.

2. Electronic lens

(1) This lens is an ordinary industrial lens, and the pupil focal length needs to be adjusted manually. After the machine is installed, when the maximum magnification and the minimum magnification are manually adjusted, the image is equally clear. If the sharpness can't be adjusted, it is regarded as a defective product, and if there are unstable factors such as jitter after adjustment, it is also regarded as a defective product.

(2) Check the coaxiality, that is, the images from the maximum magnification to the minimum magnification are taken at the same position, and cannot be offset or offset too much, which is regarded as defective, and the lens must be replaced again.

(3) The optical magnification is 0,7? 5X。

(4) Explain the definition according to the imaging reflection of the calibration block and the actual object.

3.l-shaped lens

(1) This lens is an ordinary industrial lens, and the pupil focal length needs to be adjusted manually. After the machine is installed, manually adjust the maximum magnification and minimum magnification, and the image is also clear. Those whose sharpness cannot be adjusted are regarded as defective products, and those with unstable factors such as jitter after adjustment are also regarded as defective products.

(2) Check the coaxiality, that is, the images from the maximum magnification to the minimum magnification are taken at the same position, and cannot be offset or offset too much, which is regarded as defective, and the lens must be replaced again.

(3) The optical magnification is 0,7? 5X。

(4) Explain the definition according to the imaging reflection of the calibration block and the actual object.

4, automatic zoom lens

(1) Automatic positioning, the pupil focus of the lens itself has been adjusted, and it is necessary to check whether the definition from the maximum magnification to the minimum magnification is consistent and clear.

(2) Check the coaxiality, that is, the images from the maximum magnification to the minimum magnification are taken at the same position, and cannot be offset or offset too much, which is regarded as defective, and the lens must be replaced again.

(3) The optical magnification is 0,7? 5X。

(4) Explain the definition according to the imaging reflection of the calibration block and the actual object.

Lens classification

camera lens

The classification of lenses can be classified according to focal length, aperture and lens telescopic adjustment.

(1), depending on the focal length, there are fixed focal length, telescopic, automatic aperture or manual aperture.

(2) According to the digital size of the focal length, there are standard lenses, wide-angle lenses and telescope heads.

(3) According to the classification of aperture, there are fixed aperture, manual aperture and automatic aperture.

(4) According to the lens telescopic adjustment mode, there are electric telescopic lenses, manual telescopic lenses and other types.

Film and television lens

Lens is the basic unit of film and television creation. A complete film and television work is composed of one shot after another. Without an independent lens, there would be no film and television works. Through the combination of multiple lenses and the performance of design, the production of the whole film and television work lens is completed, so the application skills of the lens also directly affect the final effect of the film and television work.