If you can find one, the Arca-Swiss B2 is what I use and would recommend, unless Arca-Swiss has finally come out with the new Z2, which has been on the drawing board for quite some time now. It's a double-ball head, so you can control fore-aft and side-to-side tilt axes independently. Tension is adjustable separately for each axis, and it uses the Arca-Swiss eccentric balls so tension increases with the tilt angle so you can control the camera without any sudden drops (presuming you haven't set the tension way too loose to begin with). It can hold 150 lbs. In other words, it's got the strength/weight ratio of a ballhead with the control of a pan-tilt head.
I posted a photo of the B2 with my 8x10" Sinar P with a fair amount of extension over on the LF forum a while back--
And I've attached a photo of it in use with the 8x10" Sinar P and 36cm/f:4.5 Heliar (the one in my avatar) on the front, with a Luc-type front-mounted shutter and a Sinar filter holder in front of that.
If you're curious, here's the photo I was making at the time--
I have the greatest respect for David and his experience. I have not tried the gear he suggests. What I have read here and the LF Forum and my own experience in 4x5, 8x10 and 7x17 is that it is very difficult to work with cameras of this size and weight with a ball head. The torque or leverage is too great too make small adjustments easy. Of course the larger the camera, beside the weight, the greater this is a factor. This is purely a matter of opinion and as such you will certainly find differences among users.
My preferences have been the Gitzo 1570 Magnesium three way head for the Linhof TK45 rigged at about 8 pounds plus lens with the macro/tel bar attached. I am told for heavier cameras there are many who find this head inadequate. I do not have experience there. For my 8x10 Phillips Advantage Series (less than 8# plus lens) I use the smaller Ries double tilt on the smaller Ries tripod. For the 7x17 Phillips Explorer (12# plus lens) I use the larger Ries double tilt on the larger Ries Tripod. Here the width of the camera presents more of a torque or leverage problem then the weight. As an old man carrying weight is not a factor because I carry anything 4x5 or larger in a baby jogger. When I set up I like everything to feel solid and be able to make minor adjustments in every direction smoothly with ease and confidence.
Ries heads are very solid. I've owned the Gitzo G1570M, and it isn't as sturdy as the Arca-Swiss B2. The double-ball arrangement of the B2 allows it to function like a pan-tilt head, unlike most other ball heads, and the range of control is larger. Most people find the G1570M too stiff for a light camera, but the B2 can handle anything from my wife's 35mm P&S to my 11x14" and 7x17" cameras.
Another ballhead that may be of interest along the same lines as the B2 is the FLM ballhead with locking tilt control. I haven't tried one of these, but the idea is that you can level one axis, lock that axis and then control the perpendicular axis--
I am curious, what ULF camera do you want to mount on this ball head? If it was up to me, I would use a Ries head for anything larger than 8x10 where weight was an issue.
DAVID: Thank you for the info and links. Apparently the Arca-Swiss is NLA but I'll take a look at the FLM.
JOHN: Thank you. I think I still want a ball head but I'll check out the Gitzo.
PAT: Thank you for replying. I'll look into the Majestic head.
GARY, and ALL: I plan on buying a Korona 5x12. The longest lens will be a Fuji 600-C or (maybe) Nikkor 800 Tele. I'll be using some type of stabilizers on the camera but I need it to safely stay put until I can lock it down for the exposure.
ALL: I should have mentioned that carry weight is a secondary concern. Also, I tried to be cheap and bought a Smith-Victor BH8. It will hold hold a Toyo 810G straight up but slips when I try to vary camera angle more than 20-25 degrees and it's unstable enough that it would worry me to leave it unattended in even the lightest breeze. This is with the knobs very tightly locked down. It would be okay, I think, for a lightweight 5x7 and for just about any 4x5. To be fair though it's only rated for 40 pounds vs. the 121 and 150 pounds of the two David referred to. I just didn't realize I needed to multiply my camera weight by a factor of 8 or 10 for the tripod head weight rating. So-o-o... it looks like I'll be spending more on a head than I anticipated.
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