What Is a Macro Telephoto Lens?

Macro lens is a special lens used for macro photography. It is mainly used to shoot very fine objects, such as flowers and insects. In order to focus correctly on very close subjects, the macro lens is usually designed to stretch longer to keep the optical center as far away from the photosensitive element as possible. At the same time, in the design of the lens group, we must also pay attention to Deformation and chromatic aberration control at close range. Most macro lenses have a longer focal length than standard lenses, so they are not completely suitable for general photography.

Macro lens

Macro lens is a kind of

It is difficult to alternate between close-up photography and ordinary photography by adding a close-up attachment with a general photography lens. The macro photography lens is different. Its close-up does not rely on other close-up accessories. All close-up operations are performed on the lens itself. It can continuously focus from close-up to infinity, so that it can change from close-up status. Quickly adjust to normal photography, which facilitates photographers to alternate between close-up photography and ordinary photography.

Macro photography lenses generally have two structures. One type of macro photography lens adopts a structure with a built-in telescopic lens barrel, and the other type

Different manufacturers use different standards to name their macro lenses, causing some confusion. In general, we think the following terms are more appropriate.

A macro lens is a lens with a reproduction ratio of approximately 1: 1.

A macro-focusing lens refers to a lens with a reproduction ratio between 1: 1.2 to 1: 2.

A close-focusing lens is a lens with a reproduction ratio between 1: 2-1: 4.

Although macro lenses are usually medium

The macro lens was originally designed to be used for remake reproduction of flat objects (documents, photos, paintings, etc.). The requirements for the lens naturally also have high image reproduction capabilities and a perfect level of reproduction. The biggest feature of a macro lens is that the imaging surface of the lens is a flat image field when taking a close-up shot, instead of showing the phenomenon that the image field is curved like the bottom of a pan, as in common lenses. This design is designed to achieve the same quality of the center and edge images of the photo when re-photographing objects such as documents and paintings. Use micro

1. Select the corresponding macro lens according to your needs

Macro lenses with different focal lengths have different application characteristics, specifically: Under the same image field ratio, the shorter the focal length of the lens, the closer the focal length; for the same focal length, the longer the focal length of the lens, the greater the image Large; short focal length lenses can emphasize the perspective of the picture, and long focal length lenses can compress the picture, blur the background, and better highlight the subject. Generally speaking, to leave a large space between the lens and the subject for lighting and lighting, a macro lens with a long focal length should be used. When photographing insects or other small animals, a macro with a long focal length should also be used. Camera, shot far from insects or small animals, so as not to be surprised and miss the opportunity to shoot.

2. Properly compensated exposure

When using a macro lens for close-ups, appropriate exposure compensation should be made according to the shooting magnification. Generally, the corresponding exposure compensation data is recommended in the instruction manual of the macro lens. At present, most single-lens reflex cameras have an automatic exposure function. When using an automatic exposure file of a camera with a TTL function, there is no need to perform exposure compensation.

3. Pay attention to the shooting quality under the macro function

Many zoom lenses also have a macro shooting function (strictly speaking, they should be called "macro function" or high-power shooting function, because many zoom lenses marked with MACRO, the shooting distance is not very close when shooting at high magnification), but with fixed-focus lens There is still a gap compared to the macro function. First, the shooting magnification is small, generally only 1: 4, or even smaller (such as the maximum macro shooting magnification of Nikon lens at 200mm focal length is only 1: 5.9, and only 1:14 at 80mm focal length ), Only a few reach 1: 2; the second is that the imaging quality of the macro lens with a zoom lens is not as good as that of a fixed-focus macro lens. However, Minolta AF Macro Zoom 3x-lx f / 1. 7-2. 8 is a special case of the zoom lens in terms of the macro function. This is a macro zoom lens, and the macro function has a higher shooting magnification than a fixed focal length lens. Large, with 1x to 3x shooting magnification (magnification shooting), and autofocus can still be performed when shooting at high magnification shooting magnification. It is the world's first autofocus photography lens with high magnification.

4. Accurate focusing

The macro lens is convenient for shooting small objects at close range, but when using a macro lens for macro shooting, the depth of field is very small, focus very carefully, and try to mount the camera on a tripod or remake as much as possible. ^[1]