OK so if the ratings aren't normalised, how do I test a tripod? I put the camera with lens on it at it's tele end and then what do I do to know it it's stable enough? If it takes a good (long exposure) picture even with the ballhead tilted, is that considered stable, or do I need to do something more?
The proper way to test a tripod is the two finger tap test. Extend the tripod as you would use it, at full height without centre column extended. Put one hand on the quick release clamp, giving it some weight similar to your setup, then with the other hand use 2 fingers and give one of the legs a good tap in the middle of the thickest section. You should be able to feel some vibration of the tap on the other hand on the quick release clamp. The vibration should not be too strong, and should fade out very fast. Bad tripods you will feel ripples of vibrations even after the first tap.
2nd test is to grab 2 legs at the thickest section with each hand. Then apply some force like a steering wheel. See how much the legs bend or give way... a good tripod should be rigid.
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