Common sense of film camera

1. Who will popularize the knowledge of film cameras for me?

The biggest difference between film camera and digital camera now is that the photoreceptor is different. The image sensitivity and memory of a film camera depend on the film, while the photoreceptor of a digital camera is a sensor and the memory depends on the memory.

Take a SLR camera as an example. 135 film camera uses a 35mm film, regardless of height. Of course, films are divided into brand, sensitivity, color and black and white, negative and reverse films, sunshine and lighting films, scenery and portraits, professional films and civil films. The difference between cameras is mainly reflected in the material, technology and performance of the fuselage.

Imaging is greatly influenced by film performance and post-processing amplification. The medium format camera uses 120 film, with a large number of frames, including 645(56mmX45mm), 6X6 (56mmX56mmm), 6X7(56mmX68mm), 6X8, 6X9 and 6X 12.

Nowadays, digital cameras in medium format all use digital backs. Another kind of film camera is a large format camera, which uses a single-page large film of 4X5 inch or 5X7 inch or 8X 10 inch. The principle of this continuous structure is accurate and simple, focusing on the skin cavity and confirming the focus with ground glass.

This kind of digitization is rare, and some are limited to the field of space reconnaissance. Another kind of camera in China, called a half-frame camera, also uses 135 film, but the frame is only half that of Quan Huafu, so the number of photos taken by a roll of film is twice that of a 35mm camera, which is 72, but it is not widely used for civilian use. It was once used as a military spy camera.

Finally, there is an advanced camera system using APS film. Their frames are APS frames, which can not only record the influence, but also record the parameter information of multiple cameras at the same time. However, this camera is a transitional product between film photography and digital photography, and it has not formed any big climate.

What do you know about this film camera? Please give me your advice. 1, could you tell me the 135 glue in the film camera?

Usually, the classification of a camera depends on its framing method and focusing method.

A SLR camera refers to a camera that uses a single-lens reflective viewfinder (SLR). Digital SLR and traditional SLR are only different in photosensitive and storage media, and the principle is the same.

In addition, SLR is a system. 35mm camera and 120 film camera all use this system.

In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder. Therefore, the same image seen by the film can be accurately seen.

The core of the system is a movable mirror, which is placed in front of the film plane at an angle of 45. The light entering the lens is reflected upward by the mirror to a piece of ground glass.

A pentaprism (called pentaprism) is installed above the ground glass. This prism reflects the image many times until it is sent to the eyepiece. At this point, the image is upright and corrected left and right.

The shutter system of SLR cameras is also somewhat different from other cameras. Almost all SLR cameras have shutters in front of the film. Because this kind of shutter is located in the film plane, it is called focal plane shutter.

When shooting, because the shutter is closed. When the shutter button is pressed, the mirror quickly rotates upward without blocking the light path (other cameras don't have this step), and the shutter opens to let the light reach the film.

Then, the mirrors in most cameras will be reset immediately; In other words, once the shutter is closed again, the mirror will quickly return to its original position. Of course, the shutter system of this SLR also has some problems, such as serious mechanical vibration, and the viewfinder can't see the image when the shutter is opened.

But for most purposes, SLR is an excellent framing system. What you see on the viewfinder screen is the final picture.

And you can use the viewfinder screen as the focus screen, because the image is clear when framing, so the shot image will be very clear. In addition, a major feature of SLR cameras is that they can install lenses ranging from ultra-wide angle (including fisheye lens) to large telephoto focal length. There is no need to buy other fuselage separately, and the portability is quite obvious (I didn't say small digital ratio).

To sum up, there is only one lens in the fuselage. A camera that takes pictures through this lens and the lens can be replaced is called a SLR. -invincible dividing line. Paraaxes have also been digitized, not only in the film age.

Leica M3 is a digital paraxial camera, but this one looks weak now. M8 is the latest paraxial digital camera in M series.

The paraxial camera is a 35mm camera like the SLR camera. It also uses the focal plane shutter, and the lens can be changed, but the framing and focusing methods are different. The paraxial is focused by ghost, and the viewfinder is on the camera side (different lenses need different viewfinders), without passing through the lens.

There is a certain parallax between the picture seen by the viewfinder and the actual shooting (advanced paraxial machine has parallax compensation function). The emergence of paraxial is due to people's demand for miniaturization of cameras, but due to structural restrictions, the focal length of the lens is very limited, so it is impossible to equip with ultra-wide-angle or telephoto lenses.

After the invention of SLR system, it gradually withdrew from the invincible market dividing line. Generally, cameras that use 120 film are called medium format cameras. Because the width of 120 film is 6cm and the length of the film can be changed according to the back, many cameras are named according to the length and width of the film.

For example, 645 (minus 6X4. 5cm), 6X6 (size 6X6cm, the same below), 6X7, 6X9, 6 12(6X 12cm), 6 17(6X 17cm).

Some cameras can change the back of different frames. For example, mamia RB67.

-a stronger invincible dividing line. Large-scale generally refers to single-track or double-track landline with 4X5 inch film. For example, 8X 10 landline.

These cameras use super-large negatives, which can be used for axis shifting and other operations. Advanced lens negatives have extremely high resolution and can be printed directly (mainly because there is no magnifying glass that big ...).

However, due to the complicated and heavy operation, it is not something that ordinary enthusiasts can play. -a stronger invincible dividing line. Lomo itself refers to a spy camera of the former Soviet Union in the 1950s, so the operation of the machine is simple. The most special thing is that its lens, through its unique bending angle, can make it shoot day and night without flashing, and it is red and blue.

Now LOMO is extended to a random shooting method. -

9- 1:4。 8) refers to the maximum aperture F3.

9-4。 8。

The focal length of a 35mm camera is 40-55mm.

PK bayonet seems to be Pentax. -

3. What's the difference between a film camera and a digital camera?

The difference between film camera and digital camera: There is basically no difference in working principle between film camera and digital camera. Both of them reflect or emit light from a scene shot at a certain point through the lens to form an object image on the focal plane.

However, there are still some differences between the two. Can be divided into the following points.

1, storage mode: film camera uses film as the carrier to store images, and digital camera uses CCD or memory card as the carrier. Both are carriers, but compared with memory cards, film is disposable and relatively expensive.

2. framing: the optical mirror used by the film camera can display clearer images; Digital cameras use an electronic reflector (EVF). 3. Print photos: the film camera should be printed in a print shop or made into a digital document; Digital cameras can print photos with their own printers.

4. Battery: Film cameras use disposable batteries, while digital cameras use disposable or rechargeable batteries.