This is a monochrome version of my first portrait w/the Semi-Achromatic.  It's entitled 'Tenebrism' for the painting term which suggests 'emerging from the darkness'.  I have my daughter Danielle looking up, and the lightsource coming down at an angle which seemed to give me the greatest amount of modeling and contour to her features.

I've found that my Profoto strobe 250 watt modeling lights in their light modifiers are perfect for the Semi-Achromatic for portraiture(so far) as the actual strobes are useless and their light so intense that  they simply blow everything out beyond recognition using this lens @F6.  This combination resulted in a shot w/out the signature glow that these lenses sometime exhibit.  As I've said before, these type lenses are different lenses depending on the light.

Take care