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Posts Tagged ‘Exposure’

With the acceptable image quality and other advantages of digital photography the majority of professional photojournalists have begun capturing their images with digital cameras. Digital photography has also been adopted by many amateur snapshot photographers, who take advantage of the convenience of the form to send images by e-mail, placing them on the World Wide Web, or viewing digital photo frames.

Also, a big advantage of digital photography is instant review of images, without waiting for the film to be developed: if there is a problem with a photo, the photographer can immediately correct the problem and take another picture (up to hundreds photographs on the same media device).
Digital cameras have been integrated into many mobile phones. The photographer is able to color balance and manipulate the image so that science can not offer traditional darkroom, although users can use the same technology film with a film scanner. But digital cameras tend to be much more sensitive to moisture and extreme cold. For this reason, photographers who work in remote areas, like those who work for National Geographic overwhelmingly favor film SLR cameras. Many digital cameras can deliver only JPEG files.

Another format that may be encountered is RAW, which contain the raw image data directly from the camera’s image sensor. Compact digital cameras usually include zoom lens and flash can not be changed, but digital single-lens reflex (DSLR or DSLR), operates on the same principles of optical and mechanical, like a film SLR camera and offers the possibility to change lenses. Manufacturers like Nikon and Canon have recently promoted the adoption of digital single-lens reflex (DSLR) to photojournalists. Lenses in the field of digital photography can be a telephoto lens, wide angle or lenss lenss Normal, used for landscapes, portraits and close-ups (macro). Digital anti-shake tools (Image Stabilisation also called) allow taking strong hand pictures where previously a tripod was required. SRLs work with digital RAW images contain unprocessed image data straight from the camera sensor.
Since the data are not processed on the camera the photographer will do it on your computer in order to obtain other useful formats such as TIFF or JPEG. This method offers the flexibility of the results regarding exposure, lighting, white balance, contrast, color saturation and greater creative control and image.

Exposure is a term you hear much in photography. It is the amount of light passing through the lens and camera body and eventually used to describe the film or image sensor collected. Proper exposure is obtained by a delicate balance between shutter speed, aperture and sensitivity of the film or image sensor (this is commonly referred to as ISO).

There is a proper exposure (objective) for each scene. For the purposes of this hub, we will focus on the techniques of proper exposure.

Although it noted quite a few things when it comes to exposure, the most important thing is to understand that a good general understanding of how light exposure, to measure the demand. It also requires a lot of practice. It is important to control exposure, so your creative energy is not whether the image is too dark or too light to spend. One of the best ways to achieve this is to shoot in manual mode, allowing you to control this important part of the production of images. To support digital cameras in this learning process through immediate feedback on your recording with the LCD display. You will therefore know immediately when the photo is underexposed or overexposed, so you accordingly if necessary.

Shutter Release of the closure concept in detail, because it is an important factor in determining the correct exposure for a scene. The closure can have an opening in the camera, light, pass through the film or image sensor. How much light they can not in size, but the time it is open. A trigger can be as fast as 1/1000th of a second, or it could be slow as 1/4th of a second.

A fast shutter speed will stop action, while a lower speed will blur moving objects such as.

It is important to note (this is repeated several times) that good lighting is a relationship between shutter speed (time), aperture (amount of light) and ISO (sensitivity of the film or image sensor).

Aperture -  The aperture is the opening of the lens. It controls how much light enters the lens, depending on how big or small the opening. An adjustable iris-metal blades, the photographer can control the size of the hole, measured in f-stops (like f/5.6, f / 8 or f/16). Translate to higher settings to smaller f-holes, to produce lower f-stop setting a larger aperture. This can be confusing, as it is counterintuitive (one would expect a higher number to correspond with a larger opening), but when you consider that this measure is actually a broken relationship is easier to remember. For example, you would probably prefer from your favorite pizza pie (for example) as a 1:5 1:16.

Equivalent Exposure One of the most important aspects for understanding the relationship between exposure shutter speed and aperture. This is known as reciprocity. The main reason for the concept of equivalent exposure / mutual understanding so that in a certain situation, then you can meet a deadline priority creative decisions of a time based on what happens to you if your camera to your eye.

Shutter speed and aperture work together to create a correct exposure. Explore many different combinations of aperture (which controls the amount of light through the lens) and shutter speed (which controls the amount of time the light is exposed onto the image sensor). So you can have multiple images of the same scene, different qualities of depth of field (in which the focus from front to back) have to be to shoot, but they all have the same exposure.

The table below shows the corresponding claims from an aperture of f/5.6 and a shutter speed of 1 / 125 As you can see how you have up or down one stop you doubling or halving the shutter speed or aperture.

Membrane cap (in seconds)
Most light f 2 1 / 1000
Least light …………
f 2.8 1 / 500 ……………………
F 4 1 / 250 ……………………
f 5.6 1 / 125 ……………………
F 8 1 / 60 ……………………
F 11 30.1 ……………………
F 16 15:01 ……………………
F 22 08:01 ……………………
F 32 04:01 ……………………
F ………… 45 2.1
Light at least one R 64 is the most light

If you understand this basic concept, many things will fall into place that will help you obtain the correct exposure. This is especially true if you take the time to remember points of exposure. All the above settings are full-stop action from the exposure. Think of them as traces inch on a ruler or full value. Many of you shoot with cameras that also 1 / 3 or 1 / 2 stops. If you have two shutter speed settings between 15 and 30, for example, know that you 1/3-stop increments, if you get one, then take 1/2-stop.

ISO (sensitivity) The other factor about shutter speed and aperture affects the overall exposure to ISO (which is a measure of the sensitivity of film or image sensor).

ISO or sensitivity is a measure of how quickly the film or image sensor to light. Higher sensitivity means that the camera needs less light for exposure. This exposure can either be done with a faster shutter speeds or smaller apertures. The specific type of film or ISO setting you choose determines the sensitivity. If you shot film, then you are probably already familiar with this as the ISO reviews of the film, such as 100, 200 or 400 Films for the extremely low light photos are at speeds of up to ISO 1600 and 3200 are available.

The higher the ISO value, the more sensitive the film is light. And with a digital camera, the higher the ISO, the less light is needed. When using a higher ISO, for example, it is likely that you will be able to hand-shot in low light – to fall without the shutter speed is so low that the camera is a little blurry image. If you use a lower ISO, you need more light or a tripod to steady a shot, the keen, is to make sure.