Exposure in Digital Photography

Exposure in Digital Photography - Shutter Speed

Exposure in Photography is determined by the Shutter Speed, the aperture of the lens, the sensitivity of the ISO and the lighting of the scene.

In this post I'm going to talk about Shutter Speed.

Shutter speed refers to how fast the shutter on the camera fires in order to capture the picture. The shutter is like a curtain in front of the sensor that opens when the user presses the button which allows light into the sensor. With a faster shutter speed you can freeze the pinwheel as if its not moving, with a slower shutter speed you can get a smooth effect on the pinwheel.

Shutter speed is measured in fractions of a second. For example a shutter speed of 1/10 means a tenth of a second. Most modern camera's are able to take pictures up to 1/4000th of a second.

Shutter speed is set differently on every camera but there is always an auto option for general photography. In order to customize the shutter speed you need to set the camera into manual mode. from there you will be able to use the dial in increase or decrease the speed.

Composition in Digital Photography

There are a few rules that have to be considered when it comes to the Composition of a shot. You have to think about the Simplicity of the shot, the Rule of thirds, lines, balance, framing and avoiding mergers. When it come to taking a shot you have to consider what it is in the shot you are focusing on. Taking a shot of a something basic such as a daisy allow the viewer to only focus on the one item. This shows a simplistic composition. Below is an image that shows the rule of thirds. The image is divided into three equal parts both horizontally and vertically. You can see in the image a butterfly along the vertical line. Lines make the viewer look into the picture more. Horizontal lines give a calming look to the image and the diagonal lines on the tracks give a dynamic look to the image. Balance gives an impression of equality to the image Framing gives a look through something to focus on the item. It's important to avoid mergers in photography

High Dynamic Range

High Dynamic Range other wise known as HDR, is a process that is applied to the image by the camera to compensate for colour loss, it gives an image a higher Dynamic range. Below you can see the effect in practise, The picture on the left shows how a camera usually captures an image and the image on the right shows a picture with HRD enabled. The way HDR works is by combining three or more photos, one with normal exposure, one over exposed image and one under exposed image. Depending on the lighting of the area it can make an image look more blown out. HDR is very useful in low light areas. If the camera is unable to take a normally exposed image it will instead combine the images to create an effect of normal lighting. Before taking a photo with HDR enabled you have to remove any movement from the shot otherwise the image will come out blurry and you will get a ghosting effect. Some advanced forms of HDR are able to to combat the effect of ghosting. To take a good H

Lighting Setups for different scenes

There are many lighting setups that give you a different effects. When choosing how many lights to use in a scene you need to first look at the subject. You need to chose what it is you are trying to portray in a photo. If you are going for a professional photo that you would use for a work place you would want to take a photo with equal lighting. Incandescent, Fluorescent, Studio Strobe and LED are some of the types of bulbs that are used in the light stands. Most cameras have a built in LED light that the user can use. Large camera such as the Cannon 750D can connect to an external flash and can fire the flash from a remote place this gives the ability to use multiple flashes in one shot. In the below shot you can see the effect of multiple lights give to the highlights in the shots. Another way you can produce a similar effect is by using a reflector which can be used to bounce light of one source to another. You can see below a shot, the light that is set up to the r

Digital Photography

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