What do you think of the lens model of SLR camera?

Brand+focal length+aperture (F value), for example, you are 24- 105, and Canon has this lens, so it is called Canon 24- 105mm f/4. Of course, there are some other parameters, such as whether it is a professional lens, whether it is anti-shake and so on. , but it is often said that the above three elements.

There must be three data on the SLR lens: focal length, aperture and focusing, but they don't directly externalize the focal length and aperture focusing, but directly give numbers and letters, which many people are blinded at a glance. Actually, understanding them is very simple. The parameters of a SLR lens are "18-50mm, 0.5m- infinity (horizontally expressed as 8 words), F2.8-3.5", that is to say, its focal length is 18-50mm, and its focal length is 0.5m, which is the largest at the wide-angle end of 18 mm. If there is anything else, you can read the brand manual first. AF-S (automatic focusing of ultrasonic motor); DX (referring to Nikon's APS frame); G (refers to G lens, generally without aperture adjusting ring); ED (ultra-low dispersion lens); VR (refers to lens anti-shake) and so on.