mrred ,

I know Weston and Adams did what you suggested but f:1.5 Ektar is famous for its bokeh and as Ian Grant warned it is only corrected for green and this blurs the not focused area even more.
I love these qualities and want to protect it , if I can not do this , I would not use that lens as a ultra sharp f:64 lens because it doesnt qualify also.

Look at Ian's link at the post. And hole or slit discusses lot at large format forum and they add abberations. I love some lenses as they are designed for .

Thanks ,