Lens reflex camera: a device function, how to choose

In place of the film for a long time came digital cameras, which store images in a file, but can not tolerate the image on the sensitive film. Among the digital, the most professional - a mirror.

They replaced the twin-lens apparatus, which simply did not catch on the digital divide. Single-lens system, preserved since the time of the film, is used today in the mirror.

Apparatus SLR

This type of camera is called "mirror" is not accidental. The design of the present mirror and pentaprism special designed to reflect the image.

Due to this, the photographer sees the image that appears before the camera lens. In this case, the circuit does not use any electronics.

The standard reflex camera assembly contains the following elements:

• Prism;
• Matrix;
• Viewfinder;
• Mirror;
• Lens.

Feature SLR, which distinguishes it from other digital cameras - a viewfinder. Of the optical viewfinder is most suitable for professional use, as it provides a number of advantages:

• No parallax effect, which spoils the photos taken with a digital camera.
• Shooting with special optics and optical.
• Macro.
• frame boundaries always coincide with the boundary of the field of view of any interchangeable lens.
• Visual evaluation of the depth of field.
• No changes in the image caused by electronic effects.
• performance speed.

Matrix installed in the reflex camera is bigger than in conventional digital devices. This creates a frame in which the photodiodes are used with other dimensions, without changing their number, which determines the resolution.

Due to this factor, the resulting image quality is improved, in addition, this function eliminates the noise.

It sold a large number of interchangeable lenses that are purchased separately. Often, even the camera is sold without a lens. Each one is unique and gives the photographer the necessary functions for shooting.

Lenses can be divided into three types:

• Wide-angle;
• portraits;
• Zuma.

Wide-angle optical lens designed for shooting scenery in the open space. They have a focus to 30mm.

Focus zooms up to three hundred millimeters. They are needed for remote shooting, and are used for optical proximity objects. Also, it is possible to meet such a term as superzoom. As the functionality of such lenses do not differ from the usual, but make it possible to shoot at a much greater distance.

The functions of SLR cameras

Function, through which so much SLR stands out from other digital cameras - this phase focus. He is not used in some other models, since his work requires a separate optical path, which allows you to split into two beams of light at the time of shooting.

Because of its accuracy and speed, it is the most advanced technology focus among currently existing.

It allows you to use Live View mode. This feature means viewing pictures, shoot camera, in real time, using the LCD screen, which in this case he becomes a viewfinder.

It is an irreplaceable thing, if you decide to engage in a serious and professional shooting. This mode is useful when, during recording intervene various difficulties, such as poor lighting or uncomfortable position of the camera, the viewfinder complicating operation.

This mode is used for capturing still life, because on the screen you can see all the shortcomings of the image, and correct them in time.

Of course, the main criterion when choosing a digital camera should be getting the picture quality. Therefore, professional photographers armed with SLRs.

It becomes possible to apply professional techniques to identify the spatial depth and visually separate the subject and the background. This is called the Boke and the need to highlight the events in the picture. In addition, SLR themselves have the quality of the optical image.

How to choose a lens reflex camera

The eight criteria that play a role when buying a SLR camera:

1. Matrix size. From it depends directly on the quality of images. Businesses choosing full frame matrix. If you are looking for a device for his own amusement or to create frivolous images capture random frames, suit and semi-full-frame matrix, which is not much inferior in quality, but it is worth much cheaper.
2. Resolution. Again, it should be understood that the fan is enough ten megapixels, which is less than that of modern cameras. Another meaning is required only if the camera you need for work and photographs published in the media format.
3. Controllability. Some devices do not lend themselves to any lens adjustment. This is a clear disadvantage. Even fans want to make settings, adjust by itself, to empower.
4. The sensitivity matrix. It all depends on the conditions in which you intend to shoot. For capturing shots in the afternoon, when illuminated, on a clear day, it is better to buy a camera with a minimum sensitivity. But if the pictures have to do in the evening, in dark rooms or at night, sensitivity need appropriate conditions.
5. The size and weight. At first glance, these options seem secondary, but do not jump to conclusions. They have an impact on the user experience. But this does not apply to professional cameras because the size and weight of the evidence about the quality.
6. Multifunctionality. We must remember what the camera is purchased and understand that not everything is suitable for photos, suitable for video. And vice versa.
7. Price. Of course, this is a factor. Both for the camera and for any other purchase. Be able to correctly calculate the budget.
8. Convenience. It is better to buy a little functional camera with which you get to work. With a professional and cumbersome - hard to handle.

How to use

Lens reflex camera - a fragile thing. To avoid breakdowns and faults, remember the rules of the reference:

1. Do not drop the device and avoid exposure to mechanical. This is the way to serious damage.
2. Avoid exposure to water and humid air. If the camera is dropped into water, take it to the nearest service. After contact with moist air, wipe with a dry cloth to disconnect the battery during drying.
3. Avoid exposing the camera magnetic fields and radio waves. They can cause serious malfunctions and damage to the camera data on the memory card.
4. It is not necessary to work for a long time in the sun or to influence the temperature in other ways.
5. In any case, do not disassemble the mechanism of selfIf you do not have skills in dealing with such a technique.
6. Do not use solvents or other cleaning agents Cleaning housing from contaminants. The lens may be cleaned only with special tools designed for this model system.
7. If you have to move the camera from a cold place into a warm roomIt can cause condensation, which leads to difficulties in the work and may cause damage to the mechanism. To avoid its occurrence, before transferring to place the camera in a special cover and do not remove until it warms up.
8. If condensation does formedYou can not use the camera until the moisture evaporates. Remove the lens, remove the battery and memory card, wait for the condensation to evaporate.
9. If you are not planning to use the camera for a long time, You need to remove the battery. Store unit is necessary in a dry and ventilated, cool place, and regularly check its performance.
10. Never store the machine in a darkroomAs it gives in chemicals that cause corrosion.
11. If you are a long time did not work with the cameraThen before shooting test the functions. To be safe, not hurt to take it to the service before using.

malfunctions

With SLR digital camera more likely to occur the following faults:

1. Crashed display. This is a common problem. The display changes in the service centers, but it is worth it dearly. The cost of replacing the display reaches half the cost of the apparatus.
2. Often breaks not the unit itself and the lens. The new lens will cost a high amount if you use a professional, expensive optics. But in eight cases out of ten the unit be repaired.
3. If the image is floating red and blue, The camera burned matrix. Replace with a new matrix.
4. If the unit does not see memory card, There may be two options damage: broken or herself memory card or connector. In the first case you need to replace the memory card with a new one. It is worth it's not expensive. If the problem is in the slot, you will have to fork out for the service center services.
5. When shooting with a flash, or fails picture is not doneThen take it to the diagnosis, to determine the cause of failure. The reason for this failure lies in the minor details that are repaired at the service center.
6. If the camera does not turn on, The reasons for this failure may be different, so the necessary diagnostics. Determine the cause of failure to fail.