Originally Posted by Ole
Ole is correct. Different companies use different methods of comparing the capabilities of their own heads. The problem is trying to understand what was/is used by the different makers. I know the way that Markins tests its heads is to suspend a weight. Markins America has some Videos of their test:
There are articles that have tested the heads for strength as well as forums elsewhere.
Here is the Nikonians review of the Markins heads including the new Q3 in comparison with other heads including those by Arca Swiss, Kirk, Really Right Stuff, Manfrotto (Bogen), Linhof, Novoflex, and FLM.
I received the Giotto ball head today, with a number of Q/R plates. Although it is very modestly priced compared to a number of other ball heads of similar size and strength I am at this point very pleased with the quality in terms of finish and smoothness of operation. I may have more to say after using it in the field for a few months.
Originally Posted by sanking
Thanks again to all who offered advice and opinion on this.