The SLR camera
The SLR camera is the most complete and versatile , today as in the past. Its strong point is the interchangeable lenses and accessories that can be attached to any kind of recovery. Thanks to the pentaprism , as we see in the viewfinder is exactly what the lens. Not only that, the exposure system and the focus and the programs , automated or not, are ” affected ” only from the image captured by the lens . Their recommendations are therefore always very precise . The name ” reflex” or the abbreviation SLR (Single Lens Reflex) is derived from its main feature Camera : mirror interior that ” reflects” what is in the viewfinder lens. SLR is the abbreviation further clarification , translated literally reads: SLR single lens.
Indeed, there are cameras that have the vision system camera, but not through the same lens used for the shot. Natural complement to the reflex mirror is the interchangeable lens . You can mount any focal length from wide angle to telephoto more stringent longer, make sure you see in the viewfinder exactly what you’re shooting . Even more specialized accessories for shooting : from macro photography with a microscope, can be mounted on the SLR without difficulty. The mirror is located inside the unit , in front of the shutter
. At the time of shooting the mirror is raised and lets the light that goes to impress the sensor.
Carried out the exposure the mirror goes down immediately. Objective , reflex mirror , and last key component, pentaprism viewfinder . To better understand the functions of this key part of the SLR follow the path taken by the light that forms the image . The light comes from the subject is collected by the lens and intercepted by the reflex mirror . This reflects upwards, towards the screen focus , in a way , obviously , specular, ie with the sides reversed.
To this was invented so called pentaprism , a five-sided prism , in which the image undergoes a series of reflections which straighten the sides , before being sent to the viewfinder eyepiece , behind which is our eye . Around these three main elements , was built the so-called ” reflex system ,” a series diapparecchi , lenses and accessories tailored to the various needs : from the most modest of amateur novice , to those sophisticated professional . The images are stored on memory cards .
Tips on what SLR camera to buy, what to look for and what are the best models
The Best Camera
The most common for SLR cameras are Compact Flash , SD follow .
All the controls of an SLR camera
Light AF autofocus systems have difficulties to act in low light conditions . For this reason, manufacturers have provided a spotlight placed on the front , which is activated when there is little light. In the jargon is called AF-assist illuminator .
Mode and over / underexposure Through the Mode button , located at the top and on the back depending on the model , you can have access to some settings .
As exposure modes , auto , shutter-priority , aperture- and manuale. All SLRs also have a small button that allows you to change the exposure.
The goal is the part of the camera that ” collects ” the image . Depending on your performance you will have different pictures of the same subject . Feature reflex system is the interchangeability of the objectives : on the same machine , you can mount the focal different .
The shutter is the device that allows light to impress the sensor and is activated by the shutter release button. The amount of light that enters is determined by the photographer when you set the exposure time. Over the shutter exposure time are controlled by electronic circuits. For convenience on the ring or on pulsane command of the times is shown the traditional scale at fixed intervals, 1/30 , 1 /60 second and so on.
Terminal 10 PIN Many cameras have a 10-pin socket to allow remote control . Through this terminal, for example , you can insert cables for the remote shutter release ( called flexible ) , or adapter to connect the device to a GPS unit .
Bracketing This function allows you to take multiple frames of the same subject by varying the exposure automatically. In this way , for example, you get three frames with pairs Rates / diaphragms different . The most sophisticated can be set to have multiple images with different white balance or sensitivity .
Controls The basic features and settings of the machine are accessible through buttons on the sides of the LCD screen . The menu button allows you to enter the main management system where you can not only change the parameters of recovery ( the main ones are also editable from external keys to speed things up ), but also set the resolution and image quality, customization of Use in AF and exposure , date and time , and more.
Through the viewfinder eye piece viewfinder and you have the vision of exactly what you are photographing , some are electronic , optical others . The latter are to be preferred in terms of quality of vision. A wheel next to the viewfinder , typically allows you to adjust the view to the possible defect of our eyes.
Who AF mode uses a reflex often requires advanced functionality and ease of use. ‘s Why manufacturers abound with buttons that can facilitate access to the most important ways . This is the case of the selector for choosing the type of reading you want to select AF , or the button to lock the focus or exposure .
The main screen SLRs , such as compact , equipped with liquid crystal displays to view images after they archiviate.È can enlarge the photos and check exposure and focus of the individual areas . The display is typically 2.5 / 3 inches. Only some models even allow you to use the monitor for framing.
Built-in flash now all cameras are supported by a small built-in flash is not very powerful, but ideal as a fill light in special situations such as portrait in backlight .
The vision of service -screen highlights from the display that shows the features and settings you are using. Some low-end SLRs do not have it .
Command dial to facilitate and accelerate the selection of settings , many cameras have buttons that pemettono direct access to image quality, white balance , ISO sensitivity . In some cases in this position there is a ring that allows the setting of the programs. The main Program, ” Shutter Priority “, ” Aperture priority ” and Manual. How about compact cameras are also present today on programs dedicated to specific situations. Most programs are , the more the machine is suitable for particular situations. For example, the exposure mode to Shutter-Priority is the one that best suits the shooting sports in general and to those in which the subject is moving and we have to lock it with a short time. The program ” sports ” or ” moving picture ” reasons in the same way and , depending on the machines , can offer something more , as for instance take into account also the focal length in use .
What happens inside a camera when you shoot. At the time of shooting the mirror is raised and lets the light that goes to impress the sensor. Carried out the exposure the mirror goes down immediately. The light that forms the image and from the subject is collected by the lens and intercepted by the reflex mirror. This reflects upwards, towards the screen focus, in a specular manner, ie with the sides reversed. Inside the pentaprism image undergoes a series of reflections that straighten before being sent to the viewfinder eyepiece.