Q&A: What types of SLR lenses are there?

For friends who like photography, this is actually a very profound knowledge. They are very particular about choosing the lens. There are various lenses on the market at present. Let me introduce the types of SLR lenses to you.

1, macro lens: Macro lens This refers to the special lens for close-up photography. Generally speaking, a macro lens is a fixed focus lens. As you can imagine from the meaning of the word macro, this kind of lens can enlarge and shoot small insects, flowers and other subjects.

2. Fisheye lens: Fisheye lens refers to a lens with a focal length of about 7 mm to 16 mm and a viewing angle of 180 degrees. Fish can be viewed from 180 degrees, so this lens is called fisheye lens. The normal visual angle of the human eye is about 50 degrees, so it is impossible to see the top of the head and feet, or the left shoulder and the right shoulder at the same time. But after putting the fisheye lens in front of your eyes, because the fisheye lens is 180? Angle of view, you can take the whole subject in front of the camera.

3. Reflective telescope head: If you install a special reflector in the lens, you can use it in the telescope head or make the focal length longer. When the focal length is 500mm, the aperture coefficient is fixed at about f5.6~f8, and it is fixed at f 1 1 when1000 mm. Generally used for observing celestial bodies and shooting wild animals, it is characterized by a ring-shaped background of defocused parts. Compared with other lenses, it is very rare and expensive, and it is a special lens that ordinary people can hardly buy. Generally, they are super telephoto fixed-focus lenses with a length of more than 500mm, so they are excellent in long-distance and vividness.

4. Celestial lens: You should know that celestial telescope is the main reflective telescope at present. In order to gather as much light as possible, it is necessary to choose a large-caliber telescope, but because the reflector is cheaper than the concave-convex mirror, the refractive telescope is mainly used below 15cm, and the reflective telescope is mainly used above 20cm. There are many kinds of focal lengths of celestial telescopes, which are generally between 100 mm and 2000 mm, so it is necessary to further enlarge the lens of the magnifying machine.

5. Soft light lens/soft focus lens: Soft light lens can open the aperture coefficient to the maximum, and the soft light effect is more obvious at this time. General exposure is to add a file on a white background, and correction is to add a file on a dark background.

6. Axis-shifting lens: If it is architecture or indoor photography, it can move up and down, left and right, and can correct the distortion (bending phenomenon). Because this angle of view can be adjusted, it is called PC lens. The lens barrel of this lens can also move up and down, left and right.

Here's a look at the relevance of the types of SLR lenses. The lenses recommended above have their own merits. When choosing, you must first understand your purpose before choosing.