Just want to say that with a heavy body and a 600/4, I can tilt the lens at 
any angle and be assured on my B1G that it isn't going anywhere. That is a 
very heavy outift. Rock solid.  Same with the 400/2.8 FD.
A B1 (reg) model could easily handle a 300/2.8 at extreme angles.  You don't 
need the B1G or B2 for a 300/2.8.
The head will not budge once tightened even lighlty. No need to crank it 
down.  Amazing tolerance and stability.
John R
<< Shooting with the Tokina AT-X 300/2.8 quickly exposed the inadequacy
 of my
 old Bogen 3262 ballhead.  Went to the store and bought a  Giotto
 MH-1000 head, which is a big improvement, but still not really up to
 handling this lens with an A-1 with a MA Drive attached.  Adjustment
 knobs are too small, for one thing, I'm getting cramps in my hands
 from loosening and tightening the head while tracking birds.  Plus, I
 REALLY have to crank down on the lock knob to get it to be really
 stable.  I'd like a head to hold everything in place also while I walk
 from spot to spot with the camera/lens mounted on the tripod and over
 my shoulder.    I was even thinking of having crossbars welded on to
 the lock and friction knobs so I could really torque them down.  
 
 So I need to think about springing for a really good ballhead.  I'm
 aware of the Arca-Swiss heads, and the Kirk head.    The Arca B-1 may
 be the ticket for me, but I'm wondering if anyone has experience with
 the B-2 and can talk about the advantages of the double ball. Better
 be major for $650!!  I think the B-1 and the Kirk are both around $350
 - are there any operational differences?  Are there other brands that
 I should consider?  As you know, my demands are mostly those of a bird
 photographer.  For normal use, this Giotto Pro head is fine -
 orniphotography (?) puts extra demands on the head.  
 
 
 Ken Durling >>
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