Introduction knowledge of SLR lens

When buying the first entry machine, the fuselage will usually be equipped with a zoom dog head. The focal length, aperture and focal length range of 18-55mm are not large, and the imaging ability is average. Sometimes I know some basic knowledge of SLR, such as the imaging relationship between focal length and aperture.

After that, start with the first fixed focus. The fixed-focus standard head is a 50mm lens, and the APS frame will also use a fixed-focus head with a focal length of 35mm as an equivalent head. This kind of fixed-focus lens has one advantage: the aperture is much larger and the blur effect is obvious. You can shoot some effects that the card machine is difficult to present. Using the shutter advantage of SLR, you can also take some photos at night without flash.

Fixed-focus lens can easily achieve the aperture below F2.8, but if the zoom lens reaches this parameter, it is a high-quality lens.

The third lens can be a large zoom lens, also called a tourist scenery lens. It is often used to take landscape photos. This is not a wide-angle bull head in professional photography. The price is not very expensive, and it can also meet the general landscape shooting on the entry machine.

Foreign factory lenses are generally cheaper and more practical. Better large zoom lens Some people will choose our small gun series.

The original bull's head, after starting really crazy photography. I began to pursue the original cow head.

Original factory fixed focus cow head, original factory zoom cow head. The price of this kind of lens is ten thousand yuan. Applicable occasions are also more specialized, such as news sports photography, natural style documentaries and so on.

Canon's bull's head is generally also called red ring head (with red ring UV), and Nikon is often called gold ring head (which can be matched with a set of gold ring UV outfit) although there is no special distinction.

Of course, there is no Lycra lens that involves the most expensive money. This is something that ordinary people can't afford to play. Interested people can learn about it.

In addition, some special shots. Such as macro, fisheye lens. Its shooting is very limited. But the shooting style is unique. It's also a fun shot.

The lens can be used with an optical filter. People who have used special effects processing of image software naturally understand what this means.

It's just that the filter puts special effects on the photo at the same time. There are many such filters, which will be introduced next time.

This lens is usually paired with an ultraviolet mirror. Its function is also a mobile phone membrane.

The first requirement for UV mirrors is naturally high transparency, and in some cases, they must be removed for use. (So it can be used as a lens cover) Of course, this is also a joke. UV can also block some invisible light that affects imaging, and special UV can also create special imaging effects.

The UV mirror is adapted to the lens, so it is not a standard part, but an adaptation key. A series of lenses can adapt to ultraviolet rays.