35mm film problem, pixel problem with 35mm film camera

The diagonal length of 35mm is a misrepresentation, and the traditional statement that the camera film size is 35mm is also inaccurate.

35mm refers to the width of the 135 film body (including the perforation) of 35mm, its source is 35 mm film film, when Germany developed the 35 mm film Leica camera, there are according to the width of the film called the camera using this film 35 mm camera (unofficial title), there is no 120 film camera called 60 mm camera.

The 135 film is indeed a code name, and the numbers 3 and 5 contained in it have no evidence of an inheritance relationship with the 35mm film or the 35mm camera. It was only available after the fifties in order to distinguish it from 35 mm motion picture film.

In foreign technical data, the camera loading method, film characteristics, and cassette and film axis types are expressed in three digits. For example, 110 represents 16 mm film, 120 means 60 mm film, 220 represents 60 mm film twice as long as 120, and 126 represents a 35 mm film that has never been popular.

With the code name of 135 film, there was also the official name of the 135 camera, which was classified according to the type of film used.

Conventional camera film is 35 mm in size, 35 mm is diagonally long, and 35 mm film has a photosensitive area of 36 x 24 mm. Converted to a digital camera, the diagonal length is about 35 mm, and the larger the CCD CMOS size.

The best civilian scanning that can be obtained on the market, that is, the electric division, the pixel of the electric division 135 reversal film, which is about equivalent to the resolution of about 40 million digital cameras, but the price is so high, one trillion data costs 1 3 yuan, and a 40 million pixel ** There are hundreds of megabytes.

Film does not have the idea of pixels, and if you look at it with the concept of pixels, it can theoretically be understood that billions of silver salt particles are equal to billions of pixels, but in practice it is almost impossible to achieve. Because film scanning is a digital process, this process is constrained by pixels and technology. We know that the number of colors is unlimited, and the two adjacent silver salt particles on the film can accommodate different colors, and even one silver salt particle can hold several colors, but when the final scanning, the limitations of scanning technology can not be detailed to each particle, so a few silver salt particles will be regarded as a pixel, then at this time, a variety of colors will be replaced by one of the colors with a large proportion, so after the film is scanned, it is often not as clear as the digital **.

No matter how many pixels, there is still a level between colors, each pixel can only accommodate one color, and two adjacent pixels are two colors, and the excess of this color is limited and leveled. Each silver salt grain of the film can hold countless colors, and the color transition between the two adjacent grains is very natural, so the color of the film is infinite.

You're talking about the film production process, which is not the same as pixels. The film is only converted into an electronic version by the film scanner, and the pixels he is equivalent to can be seen through the attributes according to the content of the shooting ** and the details of the lens.

Definitely not, pixels and particles are two different concepts. The pixel is each point of the tile, and the silver halide particles are randomly and roughly evenly distributed, with many layers, and the film imaging relies on the ** after the silver halide reacts so that the reacted silver halide can be washed off with a specific liquid. I don't know the specifics.,You can understand the development of the film.。。

The limit resolution of 35mm film using electric division scanning is unlikely to exceed 15 million pixels.

It is impossible for the scanner to scan out every silver halide particle, and the color reversal film is also divided into several layers of different colors of photosensitive layers, and when the light is sensitive, the silver halide particles will agglomerate, that is, the granularity of the silver salt, depending on the film model granularity.

Silver halide particles are silver halide crystallites, and the size of silver halide crystallites is generally between microns, and the width of thin sheet particles can reach 15 microns, and the thickness is only a few tenths of a micron.

But billions of microcrystallites are not equivalent to billions of pixels, because not each particle represents a pixel, and under the most ideal conditions, several particles overlapping up and down represent a pixel, and the combined result of the different states of these particles is a pixel information. But there are a lot of constraints to trying to represent all pixels.

The previous paragraph is actually a superficial understanding, but pixels are actually the standard of the digital age, in the microscopic field, in fact, a microcrystalline can also shoot a picture**, what scientific instruments such as tunnel scanners do this. However, the information in this paragraph is of no practical significance to the average photography enthusiast, and will not be discussed below.

Here's what it looks like to convert a negative to a pixel in practice.

1 lens, if the resolution of the lens is not high enough, no matter how good the negative is, it is useless, because the negative is already the main result when **.

2. Rinsing, good rinsing can control the size and distribution of particles, the silver halide itself is fixed on the substrate in a colloidal state, and the fixing process of rinsing will fix it.

3 scanning, want to express the concept of pixels at this time only began, the digitization of the negative is the pixelation of the particles, different scanners and scanning technologies are very different, the highest resolution can reach 25000dpi (I know the highest resolution scanner, there may be better), according to 1 * square inch calculation, equivalent to 100 million pixels.

Finally, I would like to remind you that the advantage of LZ film is not in the pixels, but in its color and gradation, which are constantly pursued by countless digital manufacturers and cannot be approached. Digital is technology, film is magic.

1. Lens features: wide angle of view, depth of field.

Large, changeable composition, large perspective effect;

2. Imaging characteristics: atmospheric, clear lines;

3. Defects of trace simple lens: rock-type close-up images are easy to distort;

4. Lens aperture: 35 and 35 2;

mm, is a classic portrait, humanistic focal length.

The lens is known as a small wide angle. But the breadth of 35mm is not as wide as the perspective and distortion of the jujube pants that make people feel extremely uncomfortable at the edges. Its advantage is that it can present the scene you see in front of you with **.

As far as the description is concerned, the perspective is the same. But the picture quality is different. The difference between zoom and prime image quality is obvious.

I don't know how to continue asking, satisfied.

Main differences and precautions between medium format film cameras and 35mm when shooting:

In terms of composition: compared with 35mm film, the format of medium format film is more square, 120 film in addition to 60x60 format, there are 60x45 and 60x70 frames, their compositions are longer and the width ratio is smaller, not as large as 35mm 36x24mm, mainly in the composition of the picture to use more ** segmented points to compose the picture, of course, when shooting still life, you can also use the central area to do the main object of the picture; The composition of the diagonal line should be paid as much attention as possible, because the picture of the near-square is not too visually striking in most cases.

For ** above: then the two films are only related to the type of film, not the size of the film.

In terms of camera use: The camera of the 135 is small and more flexible in operation. Compared to a medium-format camera, it is not too convenient, but because of its "large and heavy", it is more stable and produces a clearer picture (referring to the same magnification of the film, not the imaging factor of the lens).