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Hello,
Ball heads now have a precision fraction/tension control. In some examples, they have a separate tilt function.
Please check FLM CB-58, its weight capacity is beyond what any photographer may need(130Lb). It has also a separate tilt function(more about this in the 4th paragraph of this post).
RRS BH-55(low profile. Actually the lowest profile I know among full size ball heads in the market now), is another excellent example, but its payload capacity(50Lb) is below the FLM CB-58.
The extra load capacity beyond the camera weight, is not something passive. It's still valid or active, to facilitate friction control(for example) for more precise and smooth function.
The problem with payload capacity, is being not objective parameter, not standardized.
I used both ball heads for more than enough time now. Both are excellent, least saying.
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But, with large format(specially mono-rails), the tripod weight(alone) is as important as any other feature in the tripod itself or in the tripod head.
The tripod weight should exceed the standards adopted in the digital realm nowadays. Its very biased toward simplicity and mobility(lower size/weight) of the tripod in its self, not as an essential photo requirement.
As an example, IMO, the tripod weight of Gitzo series 4 and RRS TVC-3x series(they are equivalent/4-5.5 Lbs without tripod head) or any equivalent tripod of any sort of material, is not enough to support a monorail camera(like Sinar 4X5, C2, with usual weight lens/10Lb with lens), UNLESS an extra weight is used hanged under the top plate.
Even, if you added a 2Lb ballhead, the amount of friction needed(for gross camera adjustment) on the ball head is too high to be accommodated by a lower weight tripod for appropriate stability. The problem is exaggerated(truly not apparently) if you used a longer focal length lens.
After you lock the main knob, the fine adjustments of the camera could be transferred easily to the tripod, if it is of lower weight.
The difference in weight is not that much, if you decided to start with enough weight tripod.
If you backpack, you may have to use a field camera in the first place, and accordingly the tripod weight can be lower.
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BTW, load capacity of ballheads is much higher in general than pan-tilt-swivel(3 way) tripod heads, though the apparent! stability of the later looks more, which I think due to step by step sequence of work flow only.
Load capacity, if other components added to the tripod(leveling base, head or panning base), is the lowest number among the components of the tripod system, wither that rate is of the tripod itself or of any added piece. Please consider this when you chose to use any thing more than tripod head.
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Ball heads may be used more, due to:
* Smaller size(but not necessarily lower in weight) and can bear more weight.
* One lock to stabilize every thing. It has all axis at one point.
* Tension control, it's really precise in the top rated ballheads(not exclusive to the examples above).
* Tilt control. This if accurate, it turns your ball head to a pan-tilt head of a very high stability. The FLM CB-58 has this feature, its practically accurate.
But honestly, the tilt function of CB-58, is not scientifically accurate. Still very useful feature, because the lateral readjustment is just minor. If you consider that and compensated for it on the first lateral adjustment, you may not even need any further lateral readjustment after adjusting camera tilt.
* Muti-Format. Same size/same system of smaller plates that locks tightly every time and can be left permanently in each of your equipment.
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All that said about ball heads, it does not mean pan-tilt heads have no advantage. They have, but I know and use only ball heads since long time.
Hope you find my post useful.
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