All depends on what you are buying. A lot things I could care less about, usually knock-offs are decent enough quality. But when you go out of your way to buy t

All depends on what you are buying. A lot things I could care less about, usually knock-offs are decent enough quality. But when you go out of your way to buy the genuine product and you get a fake that's a problem. I buy photography components off Amazon, buying a B&W UV filter has become impossible on Amazon. The fakes are actually a lot better than bottom-end UV lenses which is fine, but I didn't spend $45 for a knock-off. I spent that money for the real thing. If I could get the fake at a knock-off price I'd even consider it, but the fakes are being sold as the real thing at full price. After I found out how how to spot the fakes I found that half of the UV lenses I already had were fake. The real ones are made of brass and have better glass coatings. The fakes are made of aluminum and the threads are not as good which is important for lens filters, you don't want one getting jammed on a $1200 lens. They are painted black so the main way to tell them apart is to weigh them. The amazon review comments for B&W filters have extensive coverage of how to spot the fakes: https://www.amazon.com/77mm-XS-Pro-Clear-Multi-Resistant-Coating/product-reviews/B004OVE188/ref=cm_cr_dp_d_show_all_top?ie=UTF8&reviewerType=all_reviews https://www.amazon.com/77mm-XS-Pro-Clear-Multi-Resistant-Coa...