Dirk
Privatier
I had the 20mm 3.5 UD, the 20mm f/4 AI'd, and now the AF 20mm 2.8D. The UD was overall a great lens for B&W, but not as great for color. It had flare/ghosting issues. The "Galen Rowell 20" was just so so in regards to sharpness and contrast. The AF 20/2.8D is my favorite so far. Great color, contrast and pretty compact in spite of the 62mm filter size.