308 is a small head. I would be surprised if it can handle 400/5.6, or even 300/4.5. The AS B1 I have can handle 300/4.5 nicely w/o tripod collar, if care is taken.

Regards,
Alan Chan
http://www.pbase.com/wlachan

i don't see why you should have problems with that head using that lens.
what are your tripod legs?

> I'm looking for a new ball head to replace my manfrotto 308RC, which
> isn't cut out to handle my 400mm f/5.6.  Since I hike with the tripod a
> fair bit, weight is a priority.  At the moment, I'm considering two
> possibilities:  The Acratech ultimate ball head and the Markins M-10.
> I've seen the specs for both, and the main tradeoffs seem to be better
> tension control on the markins, lighter weight and lower cost for the
> acratech.

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