Learning photography problems

Learn the basics of photography. Light ratio of portrait photography

Photographers can make full use of the inherent exposure latitude of color negative emulsion by adopting appropriate light ratio. Because of its pleasant lighting effect and good color quality, well-lit portrait photos are easily accepted by customers and usually get satisfactory results.

Photographers can make full use of the inherent exposure latitude of color negative emulsion by adopting appropriate light ratio. Because of its pleasant lighting effect and good color quality, well-lit portrait photos are easily accepted by customers and usually get satisfactory results.

Light ratio: As far as the total effect of two lamps used to illuminate an object is concerned, the intensity difference between them is called light ratio.

This can usually be expressed by a numerical ratio. For example, the ratio of 3: 1 refers to the part of the main body that receives the total effect of two kinds of light, and its brightness is three times that of the part that only receives one kind of light. This can also be expressed in photometric units. For example, the highlight part is 300 feet/candle, and the shadow part is 100 feet/candle. However, the expression "3: 1" does not represent the aperture level.

Usually, the two kinds of light that make up the light ratio are complementary light and main light.

Supplementary light: The so-called supplementary light is the light source usually located at or near the camera axis, which is used to illuminate the subject as a whole, and its purpose is to expose the details of the shadow part properly.

Only fill the light, the lighting it provides is quite dull. Due to illumination from the photographic optical axis, a satisfactory outline or shape of a three-dimensional object cannot be displayed. This kind of light cannot produce important highlights, so many photographers use relatively soft or diffuse light sources. White reflective umbrellas, skylight devices or a wide range of diffused light are often used as supplementary light.

Main light: it is the dominant light in the lighting, and the terms "keynote light" or "modeling light" are correct, because the main light really determines the "keynote" of the scene (high-key or low-key), and its position will produce the modeling outline formed by highlights and shadows. Relatively speaking, if you choose a softer and more harmonious light source as the supplementary light, you will often choose a more "harsh" light as the main light. Parabolic reflector, small silver reflective umbrella, and lights that produce flickering highlights can all be selected as the main light.

Ratio: the confusion of the concept of light ratio comes from the numbers that explain the light ratio.

It is important to remember that the main light is only used to illuminate the highlight or bright part of the subject, but it cannot illuminate the shadow part of the subject.

It should also be remembered that if the fill light is located above the camera axis, it can illuminate everything that the lens can see, namely highlights and shadows.

The light ratio expressed by numbers refers to the ratio of the total amount of light shining on the highlight to the amount of light in the shadow. The highlight part can receive the total effect caused by the main light and the supplementary light at the same time, and the shadow part can only receive the supplementary light effect.

If we can understand inverse square law, it is not difficult to control the correct light ratio.

If a specific light source is away from the subject 10 foot, the subject will receive the light of 100 foot. Candlelight lighting, so when the distance is 20 feet, what is the light intensity of the subject?

If you think that the distance is twice, that is, the brightness is half -50 feet/candle, then you may want to review inverse square law, because you are wrong! Inverse square law pointed out that all light follows to a certain extent, and the reduction of light energy is natural, which is based on the change of the square of distance.

Square refers to the multiplication of a number itself. For example, if the light is one foot away from the subject, the calculation method of the subject's luminosity is: one times one equals one, then the reciprocal is one-third, or one is divided by one, then the subject's luminosity is X (expressed in photometric units). Move the lamp back two feet, use the formula, two times two equals four, find its reciprocal, divide by four, and the illumination of the subject is only 1/4X. Move the light back three feet, three times three equals nine-that is, the light reception is only 1/9X. Returning to the problem discussed earlier, applying inverse square law's formula-multiplying the distance by itself and finding its reciprocal-it can be determined that at 10 feet, the subject receives1100 light from the light source, while at 20 feet, it only receives1/4000 light from the light source. That is to say, when the distance is doubled, the amount of light received by the subject is only the original 1/4.

Ten Suggestions on Learning Photography

1. Don't think about what you shoot mainly and what you won't shoot secondly before you come into contact with photography. It's a waste of time to think about it, let alone make a decision about what equipment to buy. 100% people don't ask themselves which street they will go to, which alley they will go to several times in their lives, and how many times they will run red lights. The road of photography is unknown, and there is no need to rely on interest to explore and advance.

2. Don't be superstitious. If you want to shoot a subject well, you must equip yourself with some equipment. For example, if you want to shoot portraits of 85/ 1.4, landscapes 16-35/2.8L, insects 100/2.8MACRO, you are the black sheep. You can also take portraits from a wide angle, and the scenery at the telephoto is particularly tasty.

3, the camera is used to create visual enjoyment, not to smash walnuts and meet gangsters to defend themselves. It is pragmatic to choose a thin and practical camera as far as possible. Of course, the appearance should be beautiful, at least it should complement your appearance.

It's best not to buy the so-called lens of traveling around the world in one mirror, because you are unlikely to travel around the world. If you can travel around the world, you can't shoot anything with a lens like 24-300. Why? Just ask a friend who bought this kind of lens. They may be depressed.

If you don't have any foundation and are not interested in learning the basic knowledge of camera, you might as well choose a digital pocket machine first, which should be able to adjust the aperture manually. Don't buy a stupid machine or a movie starter. Because once you find yourself really more and more inspired, you will spend a lot of money to buy a better camera, which is the law. It's out of date to start with film now.

6. Good-looking photos on the Internet, including excellent photos in the forum, especially digital works, are almost all carefully produced in the later stage, which is also an indispensable part of photography. Therefore, in the forum, if you are interested in asking DX, you should sincerely discuss the method of PS with them, instead of interviewing them where the inspiration comes from when they press the shutter-I mean, inspiration is hard to learn, and technology is.

7. Participating in various shooting activities can certainly improve the level quickly, but it can't further improve the level. Photography is a lonely art, whether it's portrait or landscape, there may be a unique style of work to satisfy your independent thinking. Therefore, in my opinion, if you want to make more friends, you should take part in more activities. If you want to improve your photography skills, try to practice alone and learn your own. It was fun.

8. Since you play photography, you don't have to follow too many dogmas. You can immerse yourself in self-satisfaction first, and then slowly accept other people's opinions and suggestions. After all, photography is a subjective art, of course, getting more people's recognition is an addictive enjoyment. I mean, you don't have to take other people's comments too seriously. No one knows your own photography pursuit better than yourself.

9, portraits, don't start with beautiful guys, it will give you an inertia. Real beautiful women and handsome men look good no matter how they shoot. It is suggested to start with ugliness. Shooting such models has little psychological pressure, and they generally don't demand how well you shoot. They generally know that they are not very photogenic, and once they shoot well, they will have a sense of accomplishment.

10, comments on the photography forum. For beginners, don't flatter DX. It's no use trying to teach you a few tricks in exchange for DX's favor. The correct way is to clap bricks reasonably and ask questions with questions. DX people often try their best to clarify his creative thinking, so as to improve faster.