The tripod itself is more than adequate. I do have some reservations about using a ball head for such physically long lenses, though, even a Burzynski. This is because such lenses needs dampening as well as basic support. You might try, it could work in practice with some care paid to using proper technique (MUP, cable release, *not* touching* the lens or camera). The Video 15 is good, but beefier fluid head is even better.
Bjørn, thanks for your advice. My standard tripod technique is live view focusing, mirror up, wait a few seconds, remote release, and no touching of camera, lens, or support after the mirror goes up. My past use of the 800/5.6 was with a Really Right Stuff gimbal head which is very user-friendly for aiming and works well for fast shutter speeds. I'm fortunate to be at a much lower latitude where there is the sun is usually higher in the sky and there is more light (~38 degrees latitude vs. 60 for Oslo), but I want to be better able to handle low-light situations with long lenses.
The impression might fool you. Sachtlers are surprisingly lightweight for their load support. Thus the ENG 2 CF HD, the beefiest of the 100 mm class, weighs only a smidgen above 4 kg.
I can confirm that this tripod is surprisingly light for its bulk. I resisted going this route until recently due to the expense. Cost is also why I was looking at the Video 15 rather than the 20, though the used copy of the 15 I was looking at is now gone as of this morning. Back to watchful waiting...
Edit: The fluid head is actually still available. What about using a sandbag on top of the lens to provide more dampening?
