![]() Some cameras also have additional Metering Modes such as 'Centre-weighted' and 'Spot-Metering'. ![]() The 'Metering' System will automatically work out the correct 'Exposure' by taking an average of all the tones in the complete image. Your camera should be equipped with an in-built 'Meter'. if the maximum 'Aperture' of the lens is f/5.6 then closing the 'Aperture' to f/8 may increase image quality). It is also worth noting that many lenses have a better image quality when their 'Apertures' are stopped down slightly (i.e. A wider 'Aperture' (such as f/4 or wider) will result in much less 'Depth-of-Field' which is useful in portrait photography where you need the subject in focus but the background blurred, also a wide 'Aperture' will allow you to obtain a faster 'Shutter Speed'. A smaller 'Aperture' (such as f/11 or smaller) gives a lot of 'Depth-of-Field' which is useful in landscape photography where you need the image to be sharp from front to back. ![]() The 'Aperture' affects 'Depth-of-Field' (what is actually in focus between the nearest and farthest objects in the picture). f/2.8 is a very wide aperture, and f/22 is a very small aperture). The 'Aperture' is measured in f/stops (i.e. A slower 'Shutter Speed' is also useful for aircraft landing and taking-off so that the background is blurred which gives the aircraft the impression of speed. A fast 'Shutter Speed' is useful for taking photos of fast moving jet aircraft (helps to avoid camera shake on long telephoto lenses) and a slower 'Shutter Speed' is useful for propellor driven aircraft where you need to make sure that the propeller is blurred which gives the aircraft a more natural look rather than a frozen propeller. 1/1000 of a second is fast, and 4 seconds is slow). The 'Shutter Speed' is measured in seconds or more usually fractions of a second (i.e. The 'Shutter Speed' and 'Aperture' together determine the 'Exposure', so it is possible to have a fast shutter speed combined with a wide aperture or a slow shutter speed combined with a small aperture to give the same exposure. This is determined by the 'Shutter Speed' - how long the shutter stays open, and the 'Aperture' - which is a multi-bladed iris diaphragm in the lens which can be opened up or closed down to restrict the amount of light reaching the digital sensor. The 'Exposure' is how much light falls on to the digital sensor. Below i have outlined the basics of photography to give the beginner an idea of how best to utilise a camera at airshows. You can obtain some decent results in good weather by using the Auto modes such as the 'sports mode' which selects a fast shutter speed, however, sooner or later you will need to use the manual modes (Tv, Av) to gain full control of the camera and produce much better results. This article is intended to be a beginners guide to air show / aircraft photography using a Digital SLR Camera which allows you to take control of more advanced features such as Shutter priority (Tv), Aperture priority (Av), metering etc.
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