Alan, thank you for correcting me, as i said I'm no expert in LF macro work. I k now there are lenses out there specifically made for LF macrpo work beyond 1:1. Speak with E. Wildi again at hasselblad. they might not make them but i guarrent ee he will know who does. perhaps these are microscope optics? Also speak with S inar, Rodenstock & Schneider. Sinar specifically has illustrations of such a len s on page 42 and on page 71 of the 1990 editon "The Large Format, handbook of th e Sinar System" by Carl Koch (ISBN 3-7231-2600-6) but there is no discussion of which lens it is. But if it can be fitted to a sinar board it can alsobe fitted to a hasselblad le ns mount and from there to a bellows. My feeling is that the lens is probably mu ch shorter than the 100mm lens you mention.