Canon guide


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Canon guide

  1. 1. 1
  2. 2. Aperture (AV mode) The aperture on a lens is a small hole that controls the depth of field in a photograph. Depth of field affects focus on close and distant objects, adding blur for shallow depths of field which blurs out the background so that objects in the foreground stand out more. Deep depths of field have both the foreground and background in focus, popular in landscape and architectural shots. Apertures can be controlled via AV mode on a camera, which is measured in F numbers. The smaller the F numbers means there will be a shallow depth of field, whereas a bigger F number will mean a deeper depth of field. In the picture above it can be seen that the leftmost picture (F number 1.18) has a very shallow depth of field and that the two middle cupcakes are in focus, while the rest are being blurred in the background. On the other hand, the rightmost picture using F number 10 has all five cupcakes in focus, and little to no blurring in the photo.
  3. 3. Here the milkshake bottle is in full focus whereas the background has become very blurred, making it hard to distinguish details. The focus on the bottle has created a very shallow depth of field. This photo focuses on just the bottle. F3 This is the middle point where both bottle and background are slightly in focus with a moderate depth of field. There is still some blur and it is hard to see some details in the background. This photo has everything in view. F7 This photo has the deepest depth of field and as such there is little to no blurring in the background, with both the bottle and surroundings able to be viewed in detail. As the shot has been moved back a little, the background is much more prominent here, to the point where the ‘rule of thirds’ applies (the bottle is in the middle of the thirds) F14
  4. 4. Shutter Speed (TV mode) Shutter Speed defines the length of time the lens shutter is open, allowing photograph that depict motion to be captured with motion blur – distortion that simulates movement. The speed can be individually controlled, to take less that 1/4000 th of a second, and going all the way up to 3 hour captures for long exposure photography, which can be used to photograph the movement of stars in the night sky. Above are two examples of long exposure photography. For the prolonged time that the shutter is open and photographing, the camera is able to capture every angle of the lighthouse beacon and the full rotation of the stars. Above are two examples of short exposure which is able to capture fast and precise movement/moments. The camera is able to snap a picture of the fraction of a second that an object hits the water and splashes.
  5. 5. The slow shutter speed has blurred the motion in this photo, as each millimetre of movement has been captured into one single picture. This image is also the brightest because the light has had a lot of time to enter the lens. 3 Seconds The fast speed means that more precise movement has been captured, so there is an absence of blur. However this image is very slightly darker than the top image, as less light has entered the lens. 1/30 Second This image is very dark because the extremely fast shutter speed (a 400th of a second) means that barely any light has entered the lens. However the movement has been captured precisely. 1/400 Second
  6. 6. ISO settings The ISO on a camera is a setting to determine how sensitive it is to light. It is especially useful in dark shooting conditions as a high ISO setting can bring out light, allowing images to come out well lit and in better quality. Photographers should be warned however that higher ISO settings can increase the amount of noise in a photograph. Noise is random variations of light and brightness caused by a hyper-sensitive sensor and can generally degrade image quality. It is important that ISO and brightness are ‘balanced out’ to achieve the best results. In the above picture you can see that the leftmost section, with a setting of 100 ISO has a very crisp image and lacks noise. However, on the right hand side, a high ISO of 3200 has generated large amounts of noise which have ruined the image quality and made it appear pockmarked and ugly.
  7. 7. Here a very low setting of ISO was used which resulted in a very dark image. However, no noise is present because of this. 100 ISO This image has a mid-range ISO setting and is slightly brighter than the above picture, but it has started to become a little blurry and noisy. This is on the threshold of setting balance. 1500 ISO A very high ISO setting was used in this final picture, resulting in a very bright but out of focus and noisy image. This is evidence that ISO can be used to improve image quality but must be used in moderation in order to preserve image quality. 3200 ISO
  8. 8. White Balance White balance is a technique that helps the camera to determine the colour white, as it lacks the natural perception of light that humans have. It is a useful setting that allows images to have a desired ‘temperature’ which can be cold and blue to warm and orange. This is helpful for image colour correction as photographers can set a mood to their images. Tungsten lighting is the far left setting and gives the image a very cold, dark blue tint. Blue is often considered the cold colour as opposed to orange as the warm colour, so using it in a photograph can create an unwelcome, mellow and sombre mood using this setting. The images above represent the opposite ends of the mood spectrum, achieved by using certain colours. Blue is dark and oppressive, and orange represents happiness and freedom. Saturation and darkening has likely been used in both these images to exaggerate these colours, as the right image looks to be quite unrealistic in the brightness of the colours.
  9. 9. Tungsten light / 1600 ISO Shady light / 1600 ISO White Fluorescent light / 1600 ISO Daylight / 1600 ISO What can be seen from these images is that a lower white balance causes the image to shift to a colder blue temperature, whereas the higher setting brings the colours out more and makes the image appear warmer. The top left image has a dark, unwelcoming tone yet the bottom right image appears bright and welcoming, almost friendly in a way. These images were taken in the same environment at the same time of day so the colour changes are entirely the result of the camera. All of these photos were taken with the settings 1600 ISO and 1/50 shutter speed.
  10. 10. Original image Cropped
  11. 11. Levels Dodging and burning
  12. 12. Colour adjustments