I'm a big fan of the Industar lenses, especially the Industar-50. There's a creamy smooth, jewel-like sharpness to these lenses and performs brilliantly in just about all lighting conditions (albeit, the I-50 is a bit flare prone when pointed directly at a strong light source). The Industar-50 is simply an excellent lens.
Rating: [5 of 5 Stars!]