I just scored an El Nikkor 50mm f/4, an El Omegar 75mm f/3.5, and a Wollensak Raptar 90mm f/4.5 on eBay, all for $23.99. I'm familiar with the first two, but the Wollensak I am not. I've read that they varied in quality from lens to lens. I'm not going to sweat it because at $8 a lens, what's the point? But I wondered how many of you have used one, and how do they perform?