metallilan is using this combo with his d70 + 18-70 kit lens... might want to ask him.
anyway personally i think it is very possible but if you got the $ to spare, go for the 330dx instead... much much steadier.
price wise it is about 110-120+... not much more expensive than the sprint pro
Get the 330DX if you need stability and you use it often.
For me, i don't have any heavy lenses, and i don't use my tripod often. Reason is because my sprint pro is inherited from my use of my prosumer camera before i upgraded.
The Sprint Pro is a versatile and light tripod, but i had problems getting it to be steady because its 4 section and i have to be careful not to nudge it else camera shake will occur during long exposure.
I havent had much problems with the Sprint Pro with my D70 so far...took it out for all the SFF and fireworks events... but like i said, i prefer the the 330DX for its stability...