Traditional Culture Encyclopedia - Photography major - What's the difference between Nikon 28-300, Sigma 28-300 and Longteng 28-300 in imaging effect and price?

What's the difference between Nikon 28-300, Sigma 28-300 and Longteng 28-300 in imaging effect and price?

The price of the vice factory is cheap, and the imaging effect is good, and the definition of Longteng has always been good. When I went to Europe, the equipment was too heavy, so I bought a second-hand Longteng 28-300/3.5-6.3VC lens (the one without PZD), which cost 2500 yuan and was equipped with a D700 body. The lens traveled all over the world and the shooting effect was satisfactory. There are pictures and truth.