United States photographers Norman · Rothschild in multi-year use zoom lens practice accumulated valuable experience, summing up into the following 10 reference to photography enthusiasts.
1. use of long focus af
When using a zoom lens, the correct focus method is to use long focus on coke, and then select the appropriate focal length camera; because in the long focal length, be taken of the maximum and the depth of field image, this facilitates accurate focus.
In the face of backlighting or light complex situations and to select appropriate partial metering, without having to come to be taken for metering. When shooting in peacetime, often for a focal length or long focal length of the zoom lens, with the longest focal length AF and metering, lock exposure and then select the ideal focal length, so that you do not have to move back and forth.2. on the focal length to try
Although most of the amateur photographers are extremely concerned about the zoom zoom ratio, but when used in concrete is often a long focal length used most, some even as a fixed-Zoom telephoto lens.
In fact, when you try to use other focal length to a very different picture, we will find zoom lens as a variable of the viewfinder has a rather tools that potential.3. familiar with zoom operation
Early zoom lens, zoom and focus is to adjust the second ring, respectively.
Now most of the zoom lens has been replaced by the single central control, characterized by lens focal length-pull to change before and after the rotation for AF. Therefore, just buy a new lens for photography lovers, to become familiar with and keep zooming around the direction and focus of the left or right, avoid exact focus after zooming slightly rotate when micro-adjustment ring to affect clarity. This is a lot more "conservative" photographers prefer using legacy of double-zoom lens.4. proper use of supporting structures
When using the focal length to 200mm or longer focal length of the zoom lens, the camera is fixed to a tripod, and other support to ensure the stability while shooting.
5. choose the right hood
Zoom lens than other types of lens more prone to Halo, therefore, a suitable lens hood is indispensable.
Sometimes caused by blocking the lens hood in single-lens reflex camera viewfinder screen look but on film is displayed. This happens when using a small aperture is most evident when shooting, often cause the lens hood also fall into the range of depth of field. In addition, some hood at one end of a long focal length, but the zoom to short focal length end use, it will make the photos on the camera screen look of sheltered by halo phenomena of reflection. Thus, a zoom lens to choose the right hood and fair use, is crucial.6. a mirror with increasing distance
The need to use very long focal length, spend a little money to buy a 2 doubled margin will be free to mirror your 70-210mm lens immediately into a 140-420mm hyper-telescopic zoom lens, a 3 doubled margin mirror more up to 210--630mm, making your lenses immediately ranked among the ranks of the astronomical telescope.
However, the price will be the loss of IRIS series and the clarity of the camera's photos. For example, an F4 lens plus 2 doubled from lens, IRIS will become the loss level 2; plus the F8 3 doubled margin mirror, maximum aperture becomes F11. As you know, to play the best solutions like the lens should be select force than the maximum aperture of your small level 2 to shooting aperture. Therefore, when combined with increasing distance to the consideration must be given when the mirror selection of high-speed film and tripod, meanwhile, been camera body to rest.7. use filters
Unless you really need to, and generally do not give zoom lens combined with filters.
At the beach or a salt water environment, you do need a protective lens. In order to change the color temperature, producing special effects, for example in order to deepen the color of the sky and the Elimination of reflective, needed to be using polarized lenses. In addition, plus some optional filter that will only increase the already let the lens the internal light reflection.8. control screen depth
With a zoom lens from the camera body was 1.5 metres, with a focal length camera 60mm and body from being taken by 300mm 7.5 metres distance, focal length camera photos are taken of the size of the image is the same, as picture depth two photos.
Use 60mm focal length photographs, its background with a sense of depth and space; rather, the focus of 300mm gives people the impression that the scenery is compressed, was taken and the scene seems to be "closer".
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