A Beginner’s Guide To Photography
Focal length was not given any importance in the older days. Lenses were classified into telephoto, normal and wide angle depending on the cameras in which they were used. Most people quickly learned what the focal lengths represented for their particular camera format. But these days, with so many digital camera sensor sizes and other lens peculiarities, the millimeter measurement of a lens’ focal length tells only part of the story. The effects of a lens can be now identified from the magnification factor to zoom range.
The focal length of a lens is the measurement of the distance from the center of a lens to the point at which its image is focused. The length of the lens will increase with the distance. A longer is lens is considered as a telephoto lens. The shorter that distance, the wider the angle of view. In the older days the focal length was measured in inches but now it is measured in millimeters.
A full-frame digital sensor is equivalent in size to a 35mm film frame; making this the standard focal length baseline that today’s lenses are measured against. A 10mm wide angle is considered to be short focal length and a 17mm lens can be taken instead of a 28mm or 35mm lens.
Lenses have various classifications based on focal length and the field of view they provide. A wide-angle lens provides a much greater field of view, and is generally considered to be any lens 40mm or shorter (again, in full frame equivalent terms). Lenses having focal length in between 40 to 65mm is considered to a normal lens. The view provided by normal lens is similar to that of a human eye. Telephoto lenses on full-frame cameras usually are lenses longer than 70mm, and they range upwards of 300, 600 and even 1000mm. As the focal length of a lens increases the view becomes narrower and magnification power increases. That’s why wildlife and sports photographers so often use 600mm and longer telephotos. Amateur photographers will settle with 300mm lenses.
A smaller sensor will have an effect over a lens of given focal length called the crop factor or magnification factor. A small sensor has the capability of producing a magnification of the images. This type of effect on the lens using sensors is not preferred by some photographers because they like to stick on to a certain focal length lenses. The sensor has the ability to increase the focal length of a telephoto lens and hence is preferred by several professional photographers. A 400mm lens will have the effect of a 600mm lens when combined with a sensor of 1.5 magnification.
Thus, if you want to become a photographer, it is essential for you to learn all these tips and especially the focal length concept to give a sharp edge to your photography business be it wedding photography styles or a simple amateur photography done for self satisfactions and delitment
quick wedding photography tips
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Wedding Photography: The Complete Guide £10.15 Containing advice from an acclaimed portrait and wedding photographer, this book offers comprehensive information on choosing equipment, and explains the key photographic techniques - both basic and advanced. It also includes suggestions as to what to capture before, during and after the ceremony and what to do post production.... |
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