How many meters can the lens of 18- 135 capture a clear human facial features at most?

20/0. 135*24=3.555 meters, that is, the actual size of the scene entering the screen at a distance of 20 meters should be about 3.6 meters high.

If all people come in, assuming the height of people is 1.8m, then the distance should be:1800/24 * 0.135 = 10m, that is, about10m, so a person can take a full-body photo at the distance station.

The focal length of the lens determines the magnification:

A picture with a focal length of 100mm is twice as large as a drawing plane with a focal length of 50 mm.

The picture of 135mm is twice that of 67.5mm, four times that of 33.75mm and eight times that of 17mm. Therefore, the focal length of 135mm is nearly 8 times larger than that of 18mm.

That is to say, the sun and moon photographed with 135mm end are 7 times larger than those photographed with 18mm end.

So the camera can shoot infinitely far, such as the sun, the moon and the stars. The key is how many times a small object in the distance can be magnified.

Extended data:

Personal image photography angle skills:

First of all, highlight the upward angle of the figure's height.

Shooting portraits from an upward angle can highlight the curves of women's legs and make women's bodies look more slender and beautiful. For women with short legs, photographers can choose to look up to make up for the model's own shortcomings.

When looking up, the photographer should pay attention to the least messy place on the back of the model. Looking up at the background, most people choose the sky, with the blue sky as the foil, which can highlight the main body of the picture.

Second, the true and natural head-up angle

Head-up shooting means that the camera and the person being photographed are on the same level. Head-up angle reduces the photographer's subjective consciousness, makes him more objective, closer to life, and makes the characters more friendly and natural.

When shooting, the photographer should grasp the subject's money, and focus on the subject's eyes whether standing, squatting or lying down, so that the shooting effect will be more real and natural.

Third, increase the interesting overlooking angle.

Aerial photography refers to shooting a portrait from top to bottom with a camera. Overlooking angles are not common. However, in some occasions, shooting from a reasonable perspective often leads to pictures with different effects from the usual perspective. Changing the routine shooting can add another interest to the portrait works we are used to.

When taking a portrait in a prone position, you can choose to shoot from above. Choosing the right composition is the key point of overlooking shooting. Generally speaking, you can choose diagonal composition and use some props as foil to enrich the picture and achieve a balance.

Fourth, close-up portraits that highlight the expressions of characters.

Close-up portraits, similar to headshots, are often used in portrait photography. When shooting close-ups of people, the model's face occupies a large enough proportion in the picture, which can clearly present the model's facial features and expressions, and any small flaws will be exposed in the picture.

Therefore, before shooting, the photographer needs to carefully observe the five senses of the model, so as to choose the best shooting angle, foster strengths and avoid weaknesses, and show the most beautiful and natural side of the model. This is especially important when shooting close-ups of portraits.

In order to make people's close-ups more beautiful and vivid, photographers can use some flowers and plants as decorations to make the picture look fresher and more comfortable.