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ISO In previous lessons we have talked about the basic theory of how a camera works, including some basic optics, and introduced the idea of exposure and how we control it with the exposure triangle.
What is the Light Meter? Photography light and colour challenging scene to meter For as long as people have been taking photos, there has been a need to determine how bright a scene is.
Any method of recording light can only work in a relatively narrow band without over or under exposing the image. To find the correct exposure that will record the image without over or under exposing it too much, photographers need to know how bright the scene is.
An extremely talented photographer may be able to guess a near-enough exposure, but a light meter is a far more accurate and convenient way to do it. Light meters in cameras react to how intense the light is as seen from the camera.
There are problems when the scene has parts that are much brighter or darker than others, for example shadows on a sunny day. This can trick the light meter into measuring the intensity of the light incorrectly, depending on which part of the scene was illuminating the sensor.
Modern SLR cameras use multi-point light meters, meaning that several light meters are actually scattered around the projected scene, each measuring the light intensity at that point.
Very sophistocated cameras may have dozens of metering points. How much the measured intensity of the light at each point influences the final meter reading depends on the metering mode selected by the photographer. For a more detailed look at metering modes, you can read: Introduction to metering modes.
How to Use the Light Meter As we now know, the correct exposure is created by juggling the three points of the exposure triangle: The light meter is the tool that puts us in the right neighbourhood for how these should be set.
If you are shooting on full auto, then when you meter the scene — usually done at the same time as focusing, by half pressing the shutter — the light meter gives its best guess for each of these variables.
If you want to take creative control of the photo, you can manually set each of the three variables yourself. Typically ISO is left at the default, or previous setting, and you take control by choosing aperture priority or shutter priority.
If you set the dial to Av — aperture priority, the photographer chooses what the aperture will be, and the light meter adjusts the shutter speed to mantain the correct exposure.
The reverse is true for Tv — shutter priority. The exposure meter display shows the result of the measurement taken by the light meter sensor.
It will typically look something like this: Each pip between the numbers represents one third of a stop. The arrow underneath indicates how close the current settings are to the correct exposure.There are a lot of theories and ideas about how color affects mood, composition and therefore photographs, but for at the most basic level, color can be separated into .
Four kinds of artificial light sources for photography. Light, is the main ingredient in a photograph. Many times when light isn’t naturally available, we have to find artificial light sources. The following post is from Australian photographer Neil Creek who will soon be teaching a class in portrait photography in Melbourne Australia, and is developing his blog as a resource for the passionate photographer.
Welcome to the seventh lesson in Photography – A Basic Course on the Camera. In this series, we cover all [ ]. We begin with a review of light and color.
The concepts presented here-- additive and subtractive color and their respective primaries-- are critically important for image editing. First Light Optics - Suppliers of Astronomy telescopes, binoculars and accessories from Skywatcher, Celestron, Meade, William Optics, Atik, Imaging Source, Starlight.
Understanding Color & Light. Light is the single basic ingredient required to create photographs. Without light, pictures don’t exist. Digital photography is the process of transferring light energy, carried by photons, into digital information, which can be processed and displayed by computers and cameras in the form of digital images.