There's a photo I am planning to take late this summer. It is a trail that involves star trails. I have never shot anything larger than medium format before, but I've got some time to learn.

I'm probably going to need to rent a camera and a lens.

Is there a 21mm (35mm equivalent POV) lens that works for 4x5?
Are such lenses generally sharp wide open? I'm guessing such a lens will be perhaps f5.6 wide open, which I will have to shoot at probably. I need everything from about 1500 feet away to infinity in focus which hopefully won't be any kind of a problem.

I'm just trying to figure things out. I've got several months to do so. Please let me know if you have any recommendations!

Thanks.
-K