BH-1 is 0.8kg and BH-3 is 0.5kg, IMHO this is for ULF
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IMHO for 4x5 we can save weight and money.
I've been very concerned about vibrations for 8x10, so I got two cheap tools to learn exactly what happens, IMHO when one has to make decisions about tripod/head it can be recommended to get first those two cheap tools (total $10):
Attachment 194697
Attachment 194698
For 4x5 you may check how the thing goes with a light head for DSLRs, just attach the laser to the front standard, you'll see at what wind speed you have problems. You'll see how much it takes to stop vibration after inserting a holder, and (principal) see if the tripod returns to the same direction after inserting the hoder, this is critical when a tilt is there because a change in the direction changes completely the focus plane.
Even one may calculate/learn what optical performance can be lost from vibrations in different wind conditions, this is measuring the laser spot vibration a ta distance and applying magnification, so we would know the spot blur on film for a long exposure, (if shutter speed is high then the loss is lower).
What I learned from experimentation is that for 4x5 steadiness it's easier than it looks, it is for 8x10 that the thing is more challenging when wind blows.
IMHO checking steadiness with the laser is what allows an optimal weight-steadiness balance.
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