The 55GX Centerball Tripod Head from FLM is a light yet strong ball head with a simplified but effective friction lever, a low-profile design, an anodized satin-surface ball, and a load capacity of 88.2 lb. It has a short-travel pan control and the popular FLM-designed 15°-stop function.
Additionally included is a reversible 3/8"-16 and 1/4"-20 mounting stud to enable attaching virtually any type of quick release clamp set.
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Did not overload the head. C70 with a 50mm L, simply adjusting the head, and the welding snapped off the ball of the head and camera almost fell. I have two of them, and now i'm very leary of the other one. I used it less than a year.
I recently purchased the FLM GX 55 ballhead with a lever release to replace my old RRS BH-40. This FLM head has a large 55mm ball to enable stronger clamping (88 lb. rating) compared to 18lb for my BH-40. My BH-40 (40mm ball) which I've used for many years slightly drops when locking position with heavy lenses (I't's fine for lighter lenses). I decided to go with a larger 55mm ball for increased locking strength. The FLM 55 weighs 440gm and is slightly lighter than my BH-40 which weighs 486gm. I also own a RRS BH-55 ballhead which I use on a larger tripod. The BH-55 weighs 910gm (just over twice as much as the FLM) with a similar 55mm sized ball. The FLM locks very securely with no drop. The knobs work well on the FLM. I like the knobs and the lever release on the RRS better, but the FLM works fine and is secure. The 15 degree stops for pano are nice on the FLM, I wish it had a separate tension adjustment, but adjusting the lever to partial tightening hasn't been hard. You just have to get used to opening the lock partially. The bubble level is off in my unit as others have reported which is don't like, but in my case I use the camera's built in level for final leveling so it's not as important and the ball head gets me close. The FLM is a strong bullhead with relatively light weight. The tightening lever can be pulled out easily to reposition the position of the lever during locking if necessary. This only seems to be a problem if the camera is tilted far up. The BH-40 has the same adjustment.