My worse fear was realized when I tried out the Meyer-Optik Gorlitz 58mm f1.9 Primoplan today. The butt of the lens hits the mirror on the 5D near the infinity mark. Both copies do the same thing. It's really too bad. This is a nice, compact, well made lens that has some interesting characteristics. For one thing, it has the swirling background when shot wide open, but not as pronounced as others. As usual, first use of this lens today. Need more time to evaluate.