your 70-200 should have its own tripod adapter round the lens. pop this on the tripod and the camera shouldnt really offset the balance too much.

i have a serious beefy manfrotto, all 400 quids worth (back when i had money) never going back..alternatively, try the second hand market for an older but heavy tripod.

MXV Photographic Ltd. Fine, used photographic equipment bought and sold since 1990.

or the back pages of amateur photography

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Canon Forever

1Dmk2,10D, 20mm,28-70mm,200mm, Elinchrom3000,1500,600's,500's, Multiblitz200,Bronica SQb, expensive Manfrotto tripod