Tuesday, July 12, 2005

Canon's beginner SLR site

Canon has come up with the novel idea of making its range of Digital SLRs popular with an educational site. This site is too good for a beginner to learn all the basics of photography. Canon has now become the market leader in Digital SLR category with its range of cost effective digital SLR. The prediction is that sub USD 500 digital SLR is not a distant dream. I am looking for the dream to come true!


My notes when I browsed through the webpages...

Digital SLR cameras have a reflex mirror that swings up when you press the shutter button. It allows light from the lens to pass through to the sensor. The picture is then recorded. Since a single lens and a reflex mirror are used, this type of camera is called "single-lens reflex" (SLR).

While shooting in SLR camera, the scene is not displayed in the LCD. You have to use the eye-piece.
(This is really surprising !)

The shorter the focal length (mm), the wider the view will be. And the longer the focal length, the more telescopic the picture will be.

Shutter button is positioned right at your index finger.
Will there be a customization for a left hand person?

Larger the aperture, lower the f number, narrower the depth of field
Smaller the aperture, higher the f number, wider the depth of field

The range of acceptable focus is called the depth of field.

Changing the sensitivity makes it easy to photograph bright or dark scenes. The sensitivity is called the ISO speed.

Low ISO speed for brighter scenes (lesser noise and finer image quality)
High ISO speed for dark scenes (more noise and rougher image quality)

For capturing indoor sports, you use larger aperture and slower shutter speed during to less light. But with slower shutter speeds you get hazy picture. So use higher ISO and faster shutter speeds in those scenario.

ISO controls how the sensor becomes sensitive to light.

Wide angle - lesser the focal length
telephoto - greater the focal length

The 50mm lens is called the normal lens because it gives the closest perspective as seen by the human eye. Any lens with a focal length shorter than 50mm is a wide-angle lens, and any lens with a longer focal length is a telephoto lens. A wide-angle lens covers a large area of the scene, while a telephoto lens covers a smaller part obtaining a telescopic effect.

Wide-angle lenses exaggerates perspective,while telephoto lenses compresses the foreground and background.

A wide-angle lens covers a larger area of the scene, the perspective becomes more apparent.

With a large sensor, the size of individual pixels is also larger. The pixel's larger area is more sensitive to light, resulting in better image quality.

To make white subjects look white,increase the exposure compensation.
To make dark subjects look dark,decrease the exposure compensation.
For bright colors like yellow, increase the exposure amount.

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