Off the top of my head, and not owning that particular head, I'd say that the "tension control" is achieved by how hard you tighten down the main ball knob. I've only seen a separate tension control (achieved by essentially a coaxial knob either within the main knob or at the other end of the main knob's shaft) on the pricier heads. If there is a separate BH-11 (and it's not just some store's carelessness in identifying the model number; there's not one listed on the Tiffen site, and they should know) I'd expect it to be one without the Quick release.
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