10 experiences with zoom photography

1. focus with a long focal length. When using a zoom lens, the correct focus method is to first focus with a long focal length, and then select a proper focal length for shooting. Because the maximum and minimum depth of field of the image to be taken during the long focal length, this facilitates accurate focus. In the case of complex back-to-light or light, it also helps to select the appropriate local light measurement, without approaching the subject for light measurement. During Normal shooting, a zoom lens with a medium or long focal length is usually used, focusing and measuring with the longest focal length, locking the exposure, and then selecting the ideal focal length for shooting, in this way, you do not have to move back and forth.

2. Try multiple focal lengths. Most Photography enthusiasts are extremely concerned about the zoom ratio of the zoom lens, but they often use the longest focal length at the same time, some even treat it as a fixed focal distance camera. As a matter of fact, when you try to use other focal lengths to get a very different picture, you will find that the zoom lens has a considerable potential as a variable scene capturing tool.

3. Familiar with zoom lens operations. In the early stage of the zoom lens, the zoom and focus were adjusted in two rings. Currently, most zoom lenses have been changed to single-ring control, which is characterized by changing the focal length and rotating the left and right sides of the lens to focus. Therefore, Photography enthusiasts who have just purchased a new mirror should be familiar with and remember the front and back directions of the zoom and the left and right positions of the focus, the definition is not affected by slight rotation of the adjusting ring during zoom after precision focus. This is why many "conservative" photographers prefer to use traditional dual-ring zoom lenses.
4. make proper use of the support. When a zoom lens with a focal length of 200mm or longer is used, the lens should be fixed on a tripod and other support products to ensure stability during shooting.

5. select an appropriate shadow. A zoom lens is more likely to generate a halo than other types of lenses, so a proper shadow is indispensable. Sometimes the screen of a single-lens reflective camera cannot be seen, but it is displayed on the film. This is the most obvious case when shooting with a small aperture, which usually causes the shadow to fall into the depth of field. In addition, some masks are effective at one end of the long focal length, but when you zoom in to one end of the short focal length, the photo will produce a dizzy phenomenon caused by occlusion that cannot be seen on the scene screen. Therefore, it is essential to select a proper shadow for the zoom lens and use it properly.

6. Add a mirror. If you need to use a very long focal length, you can spend a little money to buy a 2 times addition mirror, you can freely change your 70-210mm lens to 140-420 ultra-far zoom lens, A 3-fold addition mirror can reach 210-630mm, so that your lens will immediately join the ranks of astronomical telescopes. However, the cost will be the loss of the aperture level and the clarity of the photo taken.

For example, after a F4 zoom lens is added with a 2-fold addition mirror, the aperture will change to f8. after a 3-fold addition mirror, the maximum aperture will become F11. As you know, the best resolution of the lens should be to select a 2-level aperture smaller than the maximum aperture. Therefore, when you add a range mirror, you must consider using high-speed film and a tripod. At the same time, it is recommended that the subject be static.
7. Use the Filter Lens with caution. Unless necessary, do not add a filter to the zoom lens. A protective mirror is needed in a beach or salt water environment. To change the color temperature and make special effects, for example, to deepen the sky color and eliminate reflection, a polarization mirror is required. In addition, some dispensable filters can only increase the problem of light reflection in the lens, which is already a headache.

8. Control the screen depth. Use a zoom lens to take a shot at a focal length of 1.5 metres from the subject, and use a focal length of 60mm to take a shot at a distance of 7.5 metres from the subject, the size of the image to be taken is the same, and the depth of the two images is different. A photo taken with a focal length of 60mm has a deep background and a sense of space. A photo taken with a focal length of 300mm gives people the feeling that the scene has been reduced, the subject and the scene seem to be "closer.

9. Keep the distance to prevent deformation. When shooting at the wide-angle end of the zoom lens, be sure to keep a proper distance from the subject to avoid deformation of the subject. Remember that the shooting distance is the main factor affecting the effect of the perspective, rather than the focal length.

10. How to control the depth of field. You can do an experiment to use the same aperture to take two photos at the same distance at the focal length of 25mm and 50mm respectively, and then enlarge the photos taken at the focal length of 25mm, the size of the image to be taken is the same as the size of the image to be taken on the screen. After comparing the backgrounds of the two photos, you will find that the enlarged background is not as vague as the background of the first photo. In fact, the depth of field is more useful. This method is also effective when applied to fixed-focus wide-angle lenses.