The Field of View parameter should have a higher resolution.

[Vendrel]

Here's a really fine animation where the FoV value is animated as well. It looks a bit choppy because the FoV parameter only changes with a precision of one decimal place along the Bezier curve. Two more decimal places would be more than enough.

Cat

[slimbuck]

Strange, this doesn't look choppy to me. Any chance you can attach a video showing the effect?