I am considering getting a Macro lens for my Bronica SQ-B. Does anyone know how the older 110mm f.4 PS lens compares to the newer 110mm f.4.5 PS lens? I've searched around on google and photo.net but not come up with much useful information. I know the newer lens has a magnification ratio of 1:1 but I don't know about the older model.

Thanks,

Tom Kershaw