Quote Originally Posted by polyglot View Post
The non-floating versions are OK near infinity (e.g. Matt's example) but become very poor at closer focus. I found that I could get better resolution from 35mm film than I could get from the non-floating RZ67 50mm, which is a bit sad considering the 4x ratio of film area.

In other words, you really need the one with the floating element.
FWIW, my 50mm has the floating element.