CAMERA QUIZ 24.03.2016
1) Digital cameras use an electronic chip or sensor to capture an image. This chip, or sensor, requires a specific amount of light falling on it in order to reproduce an exact rendition of the scene being photographed. Each sensor has a sensitivity rating. What is this sensitivity rating known as?
This sensitivity is referred to as its ISO value
2) Which ISO value requires more light, 100 or 200?
100. An ISO value of 200 requires half the light of ISO 100. For information, the higher the ISO number the more sensitive the sensor is to light. Each step from one value to the next is called a ‘stop’. Doubling the ISO value means only half the light is required. 400 requires half the light of 200, 800 requires half the light of 400 and so on.
3) Higher values of ISO, although useful in low light situations where the use of flash is not appropriate has what drawback?
Will produce electronic ‘noise’. Modern sensors are much better in producing quality images at higher ISO values, but lower ISO values will produce higher quality images.
4) What does ISO stand for?
International Standards Organisation.
5) What is depth-of-field (DOF)?
In simple terms, depth-of-field refers to how much in front of, and how much behind, your subject appears in focus.
6) How is Colour temperature measured?
Colour temperature is measured in KELVINS, not ‘degrees Kelvin’ as some people refer to it.
7) Why is colour temperature important and how is it adjusted?
In order to avoid an unwanted colour cast, some adjustment must be made to the ‘white balance’ setting on your camera when taking images under varying light conditions.
8) Name the three parts of the exposure triangle.
Shutter speed, Aperture, ISO
9) What kind of triangle is the exposure triangle and what does this mean?
Equilateral triangle, which means if you alter one setting, you must alter another setting to compensate.
10) Explain the effect of using your camera in Shutter priority.
You choose the shutter speed and the camera decides an appropriate aperture setting. Worth remembering that depending on the light available you may have chosen a shutter speed that is too fast. In this case your camera should give you an indication of vast underexposure.
11) Explain the effect of using your camera in Aperture priority.
You choose the aperture you want and the camera decides an appropriate shutter speed. However, the aperture (f No) you choose will have an effect on the depth of field in your photograph. A large aperture, or small f No, allows the foreground to be sharp but renders the background out of focus. A small aperture, of high f No, helps to ensure both the foreground and background are in focus.
Remember to focus on the part of the image you want to be in focus.
You also need to be careful that the camera does not choose a shutter speed that is too slow when hand held. If this is the case use a tripod.
12) Explain using your camera in Manual mode.
Manual control allows you to choose both the aperture size and shutter speed. Does require more concentration but good results will give a feeling of increased satisfaction. You must also do an evaluation in your mind of the scene you are viewing. Is it predominantly bright or dark in comparison to the subject you wish to photograph? This will fool your camera into giving a false indication of what the ‘correct’ exposure should be.
13) Why would you want to leave the Auto mode behind?
To allow you, the photographer to take more control. In Auto mode the camera makes all the decisions for you, but are they the correct decisions for the effect you wanted. Did you want more depth-of-field, did you want the water flowing in the river to look more like cotton wool.
14) What is AWB short for?
Auto White Balance
15) If you have a camera with 1.5 crop factor and use a 200mm f/2.8 lens what would be the equivalent focal length.
300mm. Focal lengths are noted for full frame cameras, so crop sensor cameras effectively make focal lengths longer when using the same lens.
16) Background blur is also known as what?
17) What does the term ‘Prime Lens’ mean?
It has a fixed focal length.