I've always wondered about those Wollensaks. I had a coworker with one as a paperweight, but I couldn't get him to give it up as it had been from some early piece of lab equipment he'd owned, and it was all that was left.
I have to check again, but I think I'm only getting F22 with the JML. Of course, if you're photographing an oscilloscope and need more than minimal depth of field, you have problems other than photographic. Wonder if my 203 Ektar would fit in that shutter?