What are the dog heads and bull heads of SLR cameras?

"Dog head" mainly refers to the lenses with low configuration under the same brand, usually these lenses are arranged in the middle or low-end kit. Simply put, "dog head" refers to low-end lenses with high cost performance, average imaging effect and rough materials, such as some cheaper zoom lenses.

2. Bullhead of SLR camera

The bull's head of a SLR camera is a high-end professional lens, which usually refers to a lens group with large aperture, extremely high imaging quality and high quality. The workmanship is fine and the price is expensive, which means to praise this lens as "awesome".

: SLR camera lens

SLR, equivalent to single lens reflection. A camera using this technology has only one lens, which is used for both photography and framing. This can fundamentally solve the problem of photo quality degradation caused by parallax. Moreover, when taking a view with a SLR camera, the subject will be very clear, reflected on the focusing screen by the inclined reflector, and then reflected by the "roof prism" on the top, so that the photographer can see the scene through the eyepiece, and it is the same image as the scene, so it is very convenient to focus on the view.

Single-lens reflective framing is basically professional positioning, which must be the professional path of digital SLR cameras. Even products for ordinary users and enthusiasts have many advantages. Focal length and aperture are the two most important parameters in digital SLR (also known as SLR digital camera or DSLR for short).

The first is a wide-angle lens. In the traditional sense, a wide-angle lens refers to a lens with a focal length below 35mm, such as 28mm, 24mm or even 16mm. Generally speaking, a lens below 24mm is called a super wide-angle lens. However, since most of the digital slrs on the market are not Quan Huafu digital slrs, the focal length of the lens should be multiplied by 1.5 or 1.6, so for this kind of slrs, 16mm can be considered as a super wide-angle lens.

The second is the standard lens. Generally speaking, the focal length is 50mm or 85 mm, and the lens angle of 50mm is closest to the human eye, so it is called "head". But just because of this, it is difficult to use the pan/tilt well, because it can't take photos that people can't feel like super wide-angle or macro lenses. 85mm lens is generally a portrait lens.

The third type is a medium telephoto lens, generally 100mm or 135 mm, in which 100mm lens is generally a macro lens, and 135mm lens is also a portrait lens, only focusing on the bust, while 85mm is more focused on the portrait of the whole body.

A telephoto lens with a focal length of more than 200mm is what we call a telephoto lens. In fact, this focal lens is quite useful, and it can shoot landscapes, portraits, or ecological photography (such as birds, etc.). , especially lenses of 300mm or even more than 400mm). But this kind of lens is usually big and heavy, lacking the help of anti-shake. There are still many restrictions on the use, so it is not particularly useful.