ZazaCast
Major Contributor
Is the 501 HDV and the 7D with the kit lens too heavy for the 10-40? I'm having trouble with the silky smoothness.
Weight-wise... no... but you have to keep the weight centered on the carriage. If the weight of the lens extends too far it will cause the carriage to bind. I wish I had recommended you get the 16-60.
So...if you can, slide the camera back a bit in the head (plate adjustment) and get it weight centered...play with it a bit. Worst case, get a lighter-duty head (701 or something) for the slider or attach the camera directly to the carriage without a head.
let me know how you make out....no worries, we'll get you sliding smoothly!