Camera Lens And Filters

Buying lenses is like buying cameras: Your choice depends on your needs and the amount of money you have to spend As with cameras, it is a good idea to start simply and add lenses as your needs require them.

Some good advice would be to talk to advance photographers for advice on what lens or lenses to buy initially. Although most people start with a normal lens, it is often not the ideal choice. You may want to begin with a zoom lens that offers a variety of focal lengths. Or, if your budget allows buying more than one lens, your may want to get both a telephoto and a wide angle to begin with.

Zoom lenses does not have a fixed focal length. The focal length of the lens can instead be adjusted over a range of focal lengths. A commonly found model allows adjustments from 33 mm to 135 mm. Many zoom lenses also offers a macro mode, which allows close-up photography. While zoom lenses offers a great deal of flexibility in a single package, they are not the answer to everyone needs for lenses. Zoom lenses tend to be bulkier than fixed focal-length lenses. These are not quite as sharp unless a very high-quality is use. They are usually slower than an equivalent fixed lens.

The speed of the lens (maximum aperture) is an important a consideration as its focal length. Many focal lengths are available in two or more maximum apertures. If you often shoot in low-light situations, or need a brighter viewfinder to make focusing easier, then a faster lens is probably your best choice.

Choice of Filters

A filter is nothing more than a piece of optical glass, plastic, or gelatin that attaches to the camera lens and is use to modify the light before it reaches and exposes the film. When you use a filter on your camera, your increase your ability to control final image. For example, your can make clouds in the sky more distinct. Or you can eliminate distracting reflections on the surface of glass or water. Or you can create a very limited depth of field even on bright, sunny days when you would ordinarily have to use a small aperture and be content with its large depth of field.

Types of Filters

Contrast filters controls how colors are rendered in black and white. Contrast filers allow you to control the shade of gray more directly. Contract filters are colored red, yellow, orange, green, or blue. They follow simple rules: A colored filter tends to transmit light of its own color and block other colors. For example, a red filter allows red light to pass through it more readily than other colors.

Ultraviolet and skylight filters are designed for every specialized purposes. The ultraviolet filter, call a "UV" or "haze filter." cuts out unwanted ultraviolet light, and the skylight filter can be used in color photography to "warm" bluish shadows. Most photographers buy the filters for other distinctly different reason (lens protections).

Polarizing filters absorb glare and reflections by removing polarized light. As light is reflected off a shiny surface, it is polarized in the process. Reflected light vibrates only in one direction. The polarizing filter allows you to select the vibrational directions of light that passes through the filter to expose the film.

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Marvin Conley

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