Why is Canon 7-2 f4 a telephoto lens that poor people must buy?

Why is the Canon 7-2 f4 a telephoto lens that the poor must buy?

[Bought Blast R] This is my favorite cheap red circle telephoto 7-2 f4. People in Jianghu call it "Guo Xuwei" and his brother 7-2 f2.8 is "Xiaobai". Now Guo Xuwei second-hand as long as 19-23, cheap straight told me to clap my thigh!

[Frowning R] Advantages: light and only over 8 grams, easy to work, beautiful in appearance, and powerful. The lens is dustproof and waterproof, focusing quickly, usm motor. That's not bragging! The color of the film is accurate and light, not dry but not oily. The sharpness of the picture is higher than that of white, and the blur of 2 ends is stronger. You can see my final sample, and this lens is also very suitable for shooting products. See the last picture.

[shame R] Disadvantages: f4' s aperture is still not enough when the light is poor, and it can only improve iso. If it's a micro-camera with anti-shake body, it's ok. Use a SLR to practice the iron hand! The blurring of the 7-135 end is very general, and the little friend who took the portrait ran to the 2 end to use it.

[color R] If you have a budget of 2 and want to own a telephoto, Canon Guo Xuwei won't let you down, which is more comfortable than the old Sigma or Tenglong 7-2 2.8. Go!