How about a telephoto camera

How about a telephoto camera? For these super-large zoom digital cameras with 10 times optical zoom lens, some overall defects will have a fatal impact on the final shooting quality and user's use.

The telephoto end focuses slowly.

As we all know, the autofocus technology of consumer digital cameras is not very advanced, and it is not ideal in terms of speed. This is why many people use consumer digital cameras for a while and then switch to digital DSLR. For these 10 zoom machines, the autofocus at the telephoto end will be tested even more. Judging from these machines already on the market, many machines do have defects in this respect. Mainly manifested in the focus is uncertain, or unable to focus, which is especially obvious in dark places.

Shake when holding hands.

Most friends who are familiar with photography know the concept of safe shutter speed. The safety shutter speed is actually the reciprocal of the focal length. The so-called safety means that if the shutter speed you use is higher than the safe shutter speed, the photos you take will not be blurred because of uncontrolled shaking of your hands. On the contrary, if it is lower than this speed, it will be more dangerous. Because the focal length of a digital camera with 10 times optical zoom is very large, we are required to ensure a high shutter speed when shooting. Otherwise, it is easier to lose precious wonderful pictures.

Weight and volume

With more and more lenses used in digital camera lenses with zoom 10 times, the aperture and volume of the lens will also become larger, resulting in a corresponding increase in the volume and weight of the camera. Although there are some ultra-large zoom digital cameras with compact design, there are no ultra-large zoom digital cameras weighing less than 200 grams.

Characteristics of telephoto camera 1. The main feature of telephoto digital camera is actually similar to the principle of telescope, which changes the focal length through the movement of the lens inside the lens. The benefits of telephoto come into play when we shoot distant scenery or photographers don't want to be disturbed. In addition, the longer the focal length, the shallower the depth of field, which is the same as the larger the aperture. The advantage of shallow depth of field is to highlight the subject and blur the background. I believe that many fans pursue shallow depth of field effect when taking photos, making the photos more professional.

2. At present, the optical zoom multiple of digital cameras is mostly between 3 times and 12 times, and objects beyond 10 meter can be zoomed to 5-3 meters; There are also some digital cameras whose optical zoom effect is 10 times. The optical zoom factor of home camcorder is 10 -22 times, and it can clearly shoot things 70 meters away. Using a magnifying glass can increase the optical zoom factor of the camera. If the optical zoom factor is not enough, we can add a zoom lens in front of the lens. The calculation method is as follows: A 2-fold zoom lens is set on a 4-fold optical zoom digital camera, and then the optical zoom multiple of this digital camera will be changed from the original 1, 2,3,4 times to 2,4,6 times and 8 times, that is, it is obtained by multiplying the zoom lens multiple and the optical zoom multiple.