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I believe many of the hands of digital camera users, the majority have optical zoom lens (Optical Zoom) function. The most common is three times zoom lens, the 35mm focal length to 105mm. Some of the more stressed optical zoom DC, more 8X or even 10X optical zoom.

 

To DC when shooting portraits, the choice of focal length (that is, Zoom and to what extent) the ratio of the object on the screen has a great influence, and  thus decided to give the viewer the feeling of photographs. Many beginners are depending on the optical zoom for shooting a convenience, there stood Zoom can shoot distant scenery, which is certainly not the right attitude portraits. More professional idea is to  first decide what focal length for shooting the photograph, he then went to the most appropriate location shooting. There are levels of portrait photos taken, can not be lazy.

 

 

   

 

Model of this equipment is used to shoot the latest 8 megapixels Canon D-SLR EOS 20D, and the EF 17-40mm f/4L USM, EF 50mm f/1.8, EF 70-200mm f/2.8L USM three wide-angle, in the distance and telephoto lens.

Shooting and drawing the same sense of perspective about

 

What a short focal length (wide angle) lens photographs, with the long focal length (telephoto) lens of what is the difference? The most obvious difference is accounted for if the Model does not change the size of the screen, using wide-angle lenses need to shoot closer to Model and Model with a telephoto lens from far away would take. Model shoot the closer, the picture shown by the more intense perspective of confusion. In other words, wide-angle lens to show the strongest sense of  perspective, while telephoto lens showed the lowest sense of perspective. Sense of perspective, what is it? This is a graphic expression of three-dimensional space approach. We all know that the object will look closer to a larger, more distant objects look smaller. So we all intuitively believe that the larger object is closer to their own, smaller objects farther away from their own. Zeng paintings, the artist will apply this technique, the background scenery painted small, people will know that the landscape far away from their own.

 

 

Zoom Zoom nearly far comparison

 

We shoot in DC, through the use of different focal length lenses, to change the distance between themselves and the Model, we can change the background between the Model and the sense of perspective. Wide-angle lens photographs, before and after the distance to the subject have been exaggerated, and often photographs of the four sides will have obvious distortions. For example, take a half-length photo, if the wide-angle lens (such as 28mm or 35mm) film, we need to stand closer to the position from the Model. Model accounted for when the larger picture, a little distant background object looks very small, very strong sense of perspective, well, nearly the distance between the scene even more exaggerated than the eye can see.

 

Photographs taken by telephoto lens, far and near objects urine becomes not much difference, looks like being the distance between the two closer, photos show the smallest sense of perspective. For example, the telephoto lens (such as 105mm to 300mm) taken according to the same half-length, then we need to stand farther away from the Model position. From the  photos it seems, because the background scenery is not obvious "narrow", so the background seems to stretch out even close to the Model.

 

To the same wide-angle lens a high railing, the railing near the whole picture accounts for the height, but two or three bars later, it will become very short.

 

Telephoto lens to shoot the same one railing, railing height of no more than the distance near the significantly smaller.

 

Model assumed total area of ??the same photo to the more wide-angle focal length shot, Model and background separation between the survivors away; to take the longer focal length, Model and the background was close to the distance between the pull.

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