I've done pretty much all my research, using Google and the POTN search, and have just ordered a Manfrotto 055MF3 tripod. I also need a new head and have narrowed the choice down to the Manfrotto hydrostatic ball heads - 468MGRC2 or 468MGRC4. The difference in price is trivial and not a factor. I favour the RC4 mount because it includes two built in levels and offers a larger support platform than the RC2. But I have seen a couple of comments where people say the RC4 is too big and the RC2 (without level indicators
) is a better choice.
I found dimensions for the RC4 (410PL) plate here - http://www.missnumerique.com …0pl-1-4-et-3-8-p-854.html
- to be 65mm x 85mm.
I have a 30D with grip and a 70-200f/2.8 IS and a 100-400 IS plus Kenko 1.4X extender. Measuring the base of the grip, the dimensions of the 410PL seem ideal to me and the 65mm depth is perfect for the tripod mounts on the lenses, although the 85mm width is a tad over-generous. By comparison, the RC2 (200PL) mount, which I have on my monopod, is tiddly and I do have a concern that the plastic grip is not well supported on that, and it and and the grip's tripod thread may be subject to needless stress. I may also throw a 580EX into the mix, at times, for good measure, so that's a bit more load to consider. All up weight is about 3Kg, perhaps a tad more.
So, is the RC4/410PL really too big for a D-SLR? I don't see it myself but would like to know why others seem to think it is. Please help. The legs are on their way and I want to order the head today if poss. Thanks.

I've missed the cutoff to order today so I may as well wait till Monday and ponder further over the weekend. Of course, the ideal thing to do would be to get a hands on look at the things but my local camera stores are all completely useless and stock practically nothing in the "specialist" market like £150+ tripod heads.
