Hey there I'm looking for a recommendation for a zoom lens with the following things, but am having a hard time finding it. This is going to be used with a Preston FI+Z or C-Motion unit on an FS700, possibly with a speedbooster if it is a FF lens.

-Hard stops on zoom and focus, most likely a manual lens. I'd be afraid of breaking an AF lens even if it has hard stops.

-Zoom and focus rings can't change position while zooming or focusing

-Must be in the "normal" to wide range on the wide end, so anything with a 17 or 24 or 28 or 35 on the wide end. I don't care much about the long end.

-Constant aperture, is a major plus.

I do not need constant volume on the lens, or anything very fast.

Any help would be appreciated.