I'm in the process of building a Hasselblad H1/H2 kit for use with an IQ180 back.
I shoot mainly landscapes and need to be able to carry the kit in a backpack. I also shoot small groups. In the past, when I have gone on trips with my Hasselblad V camera, I have been able to get by with a 50mm and a 150mm.
At this stage, I can afford three lenses, one of which will be a 150mm.
I am having trouble deciding on the other two. All the zooms are too big and heavy for me.
Linhof published a diagram showing how to select lenses based on the frame size of the recording media:
Standard lens=the length of the diagonal (for the IQ180's sensor, this is 68mm and nearest lens in the range is 80mm)
Wide-angle=the length of shortest side of the frame (for the IQ180's sensor, this is 40mm and nearest lens in the range is 35mm)
Extreme wide-angle=half the length of longest side of the frame (for the IQ180's sensor, this is 27mm and nearest lens in the range is 28mm)
Telephoto=twice the length of longest side of the frame (for the IQ180's sensor, this is 108mm but I have decided on a 150mm)
My experience is that I do not use the standard lens in any of my kits very often.