The CT-2491 is the largest tripod that Oben makes. The CT line tripods are incredibly lightweight for their size. This is largely due to trimming mass off of the spider. They do not, however, perform particularly well in the stiffness tests. All together though, their combined stiffness x height / weight metric is pretty decent given the price point.
|Stiffness About Vertical Axis||472 +/- 3 Nm/rad|
|Damping About Vertical Axis||0.146 +/- 0.015 Js/rad|
|Stiffness About Radial Axis||1397 +/- 7 Nm/rad|
|Damping About Radial Axis||0.265 +/- 0.026 Js/rad|
|Weight||3.6 lbs (1.635 kgs)|
|Manufacturer weight rating||39.6 lbs|
|Maximum Height||61.0 in (154.9 cm)|
|Minimum Height||14.5 in (36.8 cm)|
|Max Height with Center Column||71.4 in (181.4 cm)|
|Base Diameter||2.4 in (6.1 cm)|
|Folded Length||22.7 in (57.7 cm)|
|Folded Circumference||11 in (27.9 cm)|
|Folded Volume||219.0 cu. in. (3.6 liters)|
|Leg Material||Carbon Fiber|
|Primary Leg Angle||26 deg|
|Top Tube Diameter||31.3 mm|
|Second Tube Diameter||27.9 mm|
|Third Tube Diameter||24.9 mm|
|Fourth Tube Diameter||22.0 mm|
|Foot Type||Retractable Spike|
The stiffness and damping data are the averages of 10 trials for each measurement. The reported error is the standard error, except in the case of the damping data. I have set the error in the damping at 10% as the standard error metric does not appropriately capture the error in fitting to the data. All of the reported specifications are measured, with the exception of the weight rating. The tripod is measured at full height, with the center column down.
Stiffness vs Height:
Example data for oscillations about the vertical axis of the tripod:
Very good fit, but rather poor stiffness and damping.
Example data for oscillations about the radial axis of the tripod:
Not the prettiest data out there, but it gets the job done.