Wow! What a surprise! First because of it's good quality, second because of it's low price. I don't know why is it so cheap, this lens offers very good quality indeed.
I was curious about this lenses quality, because it's low price. I had a more than pleasant experience with Industar-2 50mm f/3.5. So when I had a chance to buy it, I bought. Folks, I just say Wow! Amazing lens, sharp as possible with good color rendering. I have the legendary Kiron 105mm f/2.8 macro 1:1 and Tamron SP 90mm f/2.5 too, so I have experience with cult third party lenses. Industar-61 L/Z is good at least as the others, easy to focusing, very compact, very well built quality lens. I suppose this lens is definitly one of my traveller lenses.