I'm looking at some of the higher end ball-heads that support independently locking the axis' of control, like the Arca-Swiss Monoball Z2 or the FLM Centerball 58 FTQR. These seem like really nice heads, and I've read that (at least for the Z2), they're great for large-format and very sturdy, yet silky smooth. They have enormous off-axis weight tolerances (over 100 lbs).
Currently, I just got a Gitzo G1570M, rated for 22 lbs (I'm really surprised that such a large 3-way head can't hold more). It is very nice, high quality...but tilting it left and right is rather stiff. I'm not sure how easy it'd be to get fine adjustments for leveling.
So hence I'm thinking about the above-mentioned "ballheads" (really 3-way heads that happen to use balls, but allow individual control along all of the axis', just like a 3-way head). The only thing I'm concerned about if the baseplate. I bought the Gitzo G1570M to replace my Bogen 3-way head with hexplate (I think it is the 3022); the Bogen is a solid head, but I've found that the camera can rotate along the hexplate, no matter how tight I try to make it...mainly because there is only one screw. Especially with my large format 4x5 monorail, but also even with my Olympus E-3 DSLR when using long lenses, I have this problem of the camera slipping on the plate due to torque.
Hence why I got the G1570M. It has a long mounting plate with multiple screws, so for a monorail, it could be secured in two places, eliminating any possibility of the camera slipping from its orientation on the plate. For the FLM head, there is a least a long(er) plate with multiple screws. What about for the Arca-Swiss Z2?
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