A telephoto lens can shoot some beautiful bokeh!

The last necessary lens application series introduced the application of “wide-angle lens” (you can read it here if you missed it), this time we will discuss the scope and skills of “telephoto lens”!

What is a Telephoto Lens?

To simply put it, a telephoto lens is a lens that allows you to see far away. Generally, a lens with a length of more than 200mm is a telephoto lens. Some professional-grade telephoto lenses can reach upwards of 1200mm+ most of the ones we can buy are 200mm or 300mm grades, such as Canon EF 70-200mm f/2.8 L IS USM or Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II which have large apertures (f/2.8), if the budget is not large, you can consider Canon or Nikon 70-200 f/4 lens or the telephoto lens produced by the sub-factory. The 200mm telephoto can even reach 300mm, but because of the large zoom factor, photo imaging is generally not as good as mentioned before.

The 70-200mm f / 2.8 from Canon and Nikon is a famous telephoto lens

Canon and Nikon have launched 70-200mm long focal length zoom lenses

Telephoto Lens Characteristics

When using a telephoto lens, we can consider the following points to note:

(1) Taking a Distant Shot

The easiest thing to understand about a telephoto lens is that it allows you to shoot further, but is further better? Otherwise, we have to consider several factors when choosing a telephoto lens:

  1. The distance of the shooting object if the shooting object is not too far away, some telephoto lenses will only have the widest angle 70mm, then we have to frequently change the lens, which is very inconvenient. When shooting events, the subject may have to move around, and some lenses with too long of a focal length may cause you to lose a wonderful picture.
  2. On-site light considerations In addition to expensive telephoto lenses, a general aperture is only f/4 or smaller, and the “tianya mirror” covering 18-200mm may only have a maximum aperture of f/5.6 at the 200mm end. If the on-site luminosity is not enough, We must increase the ISO to maintain the shutter speed, so that the image quality is reduced.

7Animals that are easily frightened are best shot with a telephoto lens. 8Take a picture of the moon in the sky!

(2) With Magnifying Effect

A telephoto lens can make the background scenery appear larger than the photos taken with a wide-angle lens.

Using telephoto can make the background moon bigger!Using telephoto can make the background moon bigger!
(Photo by Laurent Laveder)

(3) The Characteristics of “Compressing” The Scenery

A telephoto lens can make the distance between the subject and the background look relatively small. Even if the background is far away from the subject, the telephoto lens can still make the background and the subject stick together.11a Compress the scene like a picture.

(4) Higher Safety Shutter Requirements

The safety shutter refers to how fast the shutter speed is required to keep the picture clear when shooting with a handheld. The calculation method is very simple:

Safety shutter = (1/focal length) seconds

Therefore, the longer the focal length, the higher the safety shutter requirements. For example, with a focal length of 200mm, the safety shutter is 1/200 second! 3The long focal length makes it easier to compose a distant scene.

(5) Shallow Depth of Field

When shooting shallow depth of field, the focal length is one of the important factors-the the longer the focal length, the stronger the shallow depth of field effect. If you are using a telephoto lens and want the entire picture to be within the depth of field, you need to use a smaller aperture, this may cause underexposed.4 Long focal length can easily shoot shallow depth of field.

(6) The Influence of Subject Movement is Greater

When using telephoto, a slight movement of the subject can be easily seen in the photo. The disadvantage of this effect is that the clear shutter speed is faster (point 4). The advantage is that when shooting the rails or stars We only need a shorter time to capture a long track, so we should use it carefully. Telephoto can take a long time to shoot a long star trail, showing that the slight movement of the subject can also affect the photo.Telephoto can take a long time to shoot a long star trail, showing that the slight movement of the subject can also affect the photo.