How to judge the quality of the lens?

In fact, the structure of the lens is very tight. To accurately identify the quality of wedding photography lens, special optical instruments are needed.

There are usually several simple identification methods:

1. Look at the maximum aperture of the lens. The larger the aperture of the lens, the stronger the photosensitive ability, which can adapt to the weak lighting conditions and make rapid exposure.

2. After the focal length and field of view are determined, the design of large-aperture lens is much more difficult than that of small-aperture lens, because large-aperture lens needs very complicated structure to effectively correct some defects caused by large aperture.

3. Observe the resolution of the wedding photography lens. The resolution of wedding photography lens is expressed by the number of lines that the focal plane II can distinguish in the range of1mm.

4. The resolution of the lens in the field of view and the edge of the field of view is different, the former is stronger than the latter. The higher the lens quality, the stronger the resolution.

5. You can take a line board and observe the resolution of the wedding photography lens to judge the quality.

6. Observe the clarity of the image boundary. The clarity of the image boundary refers to the degree to which the wedding photography lens is clear and the shadow is slender. If the lenses are processed well, the refractive index of each lens is matched accurately, the combination of concave and convex radians is appropriate, and the device is strict, then the definition of the image boundary is relatively high.

Finally, I would like to remind you that in the process of identification, you can put a piece of ground glass behind the wedding camera and observe the handwriting in books and newspapers through it to test the clarity of the image. Try it, I hope it can help you.