Great image quality but with loud aperture noise !

January 03, 2019
I just bought this lens after seeing so many good reviews, comments and also watching many test videos. Everything is fine except for one thing. The aperture blades are chattering, making noise every time I change them. After a bit of search on internet I found out that many people had this issue as well. I'm still not sure if my lens is faulty or is it just the way this lens is. I'm kind of disappointed because even my kit lens with Sony a7 iii didn't make such noises. Considering many people say it's an almost silence lens I doubt mine, then again there are many people facing the same issue. Hope someone could give some information on this.