Originally posted by stevebrot I also remember a solution with the ball head mounted upside down on the legs and the QR clamp adapted to the base of the ball head. This could be done as a DIY project for someone with access to metal working tools. A rotating adapter to the QR clamp might be another solution, assuming they make such a thing.
That would be the Arcatech GP ballhead. The ballhead is designed to also work in the inverted position, thus making it a panning ballhead (single row). It's designed to work as a regular ballhead, a panning ballhead and a gimbal. It is a bit pricey, but in that it multifunctions very well and can hold 25 pounds, cost wise it can be justified.
Its been at least 7 years now that I have had it - and I would buy it again. I did have to swallow hard, when I ordered it. It was not cheap. With its arrival, my wife declared that it had best be a jewel encrusted astronomical instrument. I did survive. Its odd appearance and absolute first class machining saved my hide. The TSA once pulled me aside to open my luggage, as they could not figure out what it was from the X-ray.
"Mechanical Support", does get expensive. The legs, head, clamps, plates, L-brackets, etc. - and they really should all be interchangeable and inter-operate with one another. The machining needs to be good, the materials light, easy to use in the cold and dark, they need to work and not fail (and NOT let your camera & lens go "Spalding"- as in bounce, bounce, bounce down the hill)- and there is some junk out there.
As I posted earlier, you can piece part a solution together with a regular ballhead, by putting a panning clamp under the camera body. These range from about $50 to $125. When added to the cost of a good ballhead, your back to the same price range of a Acratech GP or a Arca Swiss P0. You can google "panning clamp" or "panning head", click on images and see a whole array of parts. Here is what one looks like.
Another alternative is to have a self leveling tripod - which essentially has the bottom half of a ball around the central column, thus you are essentially back to a ball in ball design. This eliminates the need for a panning ballhead or the panning clamp, but increases the price of the tripod. So, it comes down to where, how and in what way do you want to spend your funds, and design your "support" system. There are number of vendors who offers these - but you need to really look for them. Induro, Feistol and Benro are a couple - along with the wooden tripod folks - Berlebach (really nice tripods by the way). A lot of the surveyor tripods have this feature. You can also google "leveling tripod".
About 18 months ago, I started seriously thinking that a geared head (your 3D head) would help in a number of circumstances. I decided on a Manfrotto 410 as the least costly alternative - then started searching craigslist. After about 6 months, I came across one that was what I wanted to pay. The $270 new was ok, but I needed to try to reign in the "mechanical support" costs. I actually found one from professional photographer who was selling his old one (fully amortized) and had upgraded to an Arca Swiss Cube ($1K). I scored under $100 with shipping - but it took time (and some luck) to eventually find a deal. The ballhead is good for most (90%), but for doing some astro stuff, I wanted to aim a bit better - so the geared head allowed me to independently dial in small changes for each individual axis, in a controlled manner.
Also, along the same line of reigning in "support" costs. I have a travel tripod (Benro travel angle), but I really needed something heavier and sturdier that I wanted to keep in the truck. Craigslist again. I found a old Manfrotto 3001BD 3 segment aluminum - in great condition, weight really did not matter, but it needed to be heavier/sturdier than my travel tripod. This one would never fit into my carry on luggage. Again, scored it (and a ballhead that I hated) for under $100. Then I turned around and sold the Manfrotto 486RC2 head and the legs were nearly free.