I want to use it with my Hasselblad and 180/4 lens. Problem is that to get the magnification a +3 diopter would give me, I would need to stack at least a 55mm and 32mm tube together, and I donīt want to do that. (I do not have tubes anyway). My plan was to get a 67mm/B60 adapter ring and a 67mm close up lens, so the Hasselblad shade would still fit over it. I know there are the Zeiss Proxars but these are only single lenses and though second hand, still nearly as expensive as a decent achromat.