Before I ended up with an NOS lens, I used my original but,,,,,,it needed work to get 30+ years of scratches out. I actually sanded it, starting with 600 and working up to 2,000 and then a sequence of progressively finer polishes and it turned out pretty darn nice and a couple weeks later my fingers and arms recovered as well, lol. If you held it up to the sun, you could see the typical swirly looking micro scratches but installed in the car, it was almost invisible. One downside, it seemed to glare a lot more than an untouched lens. The NOS one is much better in the sun. I wonder if they have some sort of anti-glare coating on them originally(?) sort of like what XfbodyX was mentioning. It's like the difference between plain glass and glass used for framed art which is anti-glare, if that makes any sense.