How to use telephoto lens for portrait photography

Telephoto is the focal length commonly used in portrait shooting. The fixed focus of 135 is good, and the zoom lens of 70-200 is more flexible.

If you choose a 70-200 lens, you should consider the following aspects:

1, blur: background blur is a common means to highlight the subject, which is generally obtained by long focal length and large aperture;

2. Sharpness: To maintain a high sharpness, it is necessary to ensure the shutter speed and stability. Shutter speed should be within a safe shutter range, such as 200 focal length, which is generally higher than 1/200 seconds (full width) and 1/300 seconds (non-full width). If the light is bad, you need a tripod.

3. Image quality: It is mainly determined by ISO (sensitivity). When the light is good, use low sensitivity (such as ISO 100) and use high sensitivity (such as ISO 1600) when the light is poor. When the sensitivity is low, the picture is pure; When the sensitivity is high, the picture is rough, and taking black and white photos generally likes the effect of particles.

4, light: indoor shooting can use flash; Outdoor shooting can use flash or outdoor lighting. Keeping enough light is often more important than using a cow's head.