Why Canon's lenses are much more expensive than Longteng's, and why the lenses with the same parameters are so different. 28-300 which brand of lens is better? thank you

Canon's red circle lenses are all good, and the non-red circle1585501.81.4851.8.

They are all very good. 55 250 can

Other non-red circles have no advantage over Longteng, and there are even many Canon non-red circles without Longteng.

Tully's head sharpness is higher than Canon's non-red circle, and the color is good.

Not to mention, Zeiss,

From a technical point of view, the high-end technology and technology of lenses are in the hands of the deputy factory. Look at the most advanced optical field in the world, which is monopolized by carl zeiss Ricoh Optical Longteng Optical. From the optical stepping mask aligner for manufacturing CPU to the field of microscope, from the bonding of resin lens and optical glass to ultra-low dispersion lens without fluorite, all of them are the optical breakthroughs of professional vice dragon.

However, Canon Nikon can make some restrictions on whether the lens and the fuselage cooperate with each other.