The choice of focal length of portrait photography lens!

1, with a head of 50 or 135, by adjusting the distance, the size of the people in the photo is the same, but the imaging effect is definitely different. Mainly the problem of perspective distortion. The head with a wider focal length is closer to the lens, and the nose will look bigger when it is taken out, because the nose protrudes closer to the lens. When the person is far away from the camera, the nose will appear flat, because the farther the distance is, the more the sense of distance will be compressed, and the distance between the person and the background will appear closer.

2. Generally speaking, the best focal length of a portrait in formal attire is 80- 135mm. So the perspective distortion will be smaller. But if your camera is in APS-C format, there is still a conversion rate problem. For example, the conversion rate of 50 PTZ on Canon SLR is 1.6 times, that is, 50* 1.6=80mm, and the focal length is suitable for portraits (75mm after Nikon conversion, this focal length can accept portraits). The head of 85 is 136mm, and the portrait is not bad. The head of 135 is 2 16mm, and the focal length is too long. So many people take conventional portraits of 50 or 85 heads. But at the age of 85, you need to keep a distance of about 4-5 meters to take a bust, and the distance to take a full-length portrait is even longer. Some people can't move indoors with limited space, so they can only use it outdoors. If you use full width, you don't have to consider the conversion rate.

3, 85 Jiao Wai is generally better than 50. However, a 50-head one is also good in Jiao Wai, such as a smart horse with a 50? Jiao Wai with branches of 1.8 and 1.4 is better. Nikon? 50? 1.4G is better than1.4d. Basically, judging the Jiao Wai of a lens, one is that the linearity is smaller, and the other is that the Jiao Wai spot is more round.

4, the background is pale, this statement is a bit general, I don't quite understand what you mean. It may be related to background selection, equipment or technology. ?

Supplement:

If you are APS-C(D7000, 60D, 7D, entry machine), you can consider 50 or 85 orders.

If full-width (D700, D3, 5D2, 1D3) is used, consider setting 85 or 135. ?

If you don't understand, please ask.